529 lines
17 KiB
C++
529 lines
17 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wall -Wrange-loop-bind-reference -Wno-unused -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wloop-analysis -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wrange-loop-analysis -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wloop-analysis -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
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template <typename return_type>
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struct Iterator {
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return_type operator*();
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Iterator operator++();
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bool operator!=(const Iterator);
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};
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template <typename T>
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struct Container {
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typedef Iterator<T> I;
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I begin();
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I end();
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};
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struct Foo {};
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struct Bar {
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// Small trivially copyable types do not show a warning when copied in a
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// range-based for loop. This size ensures the object is not considered
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// small.
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char s[128];
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Bar(Foo);
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Bar(int);
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operator int();
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};
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// Testing notes:
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// test0 checks that the full text of the warnings and notes is correct. The
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// rest of the tests checks a smaller portion of the text.
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// test1-6 are set in pairs, the odd numbers are the non-reference returning
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// versions of the even numbers.
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// test7-9 use an array instead of a range object
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// tests use all four versions of the loop variable, const &T, const T, T&, and
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// T. Versions producing errors and are commented out.
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//
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// Conversion chart:
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// double <=> int
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// int <=> Bar
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// double => Bar
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// Foo => Bar
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//
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// Conversions during tests:
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// test1-2
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// int => int
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// int => double
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// int => Bar
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// test3-4
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// Bar => Bar
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// Bar => int
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// test5-6
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// Foo => Bar
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// test7
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// double => double
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// double => int
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// double => Bar
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// test8
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// Foo => Foo
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// Foo => Bar
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// test9
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// Bar => Bar
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// Bar => int
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void test0() {
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Container<int> int_non_ref_container;
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Container<int&> int_container;
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Container<Bar&> bar_container;
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for (const int &x : int_non_ref_container) {}
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// expected-warning@-1 {{loop variable 'x' binds to a temporary value produced by a range of type 'Container<int>'}}
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// expected-note@-2 {{use non-reference type 'int'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const double &x : int_container) {}
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// expected-warning@-1 {{loop variable 'x' of type 'const double &' binds to a temporary constructed from type 'int &'}}
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// expected-note@-2 {{use non-reference type 'double' to make construction explicit or type 'const int &' to prevent copying}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:21-[[@LINE-3]]:22}:""
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for (const Bar x : bar_container) {}
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// expected-warning@-1 {{loop variable 'x' creates a copy from type 'const Bar'}}
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// expected-note@-2 {{use reference type 'const Bar &' to prevent copying}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:18}:"&"
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}
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void test1() {
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Container<int> A;
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for (const int &&x : A) {}
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// No warning, rvalue-reference to the temporary
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for (const int &x : A) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'int'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const int x : A) {}
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// No warning, non-reference type indicates copy is made
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for (int&& x : A) {}
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// No warning, rvalue-reference to the temporary
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//for (int &x : A) {}
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// Binding error
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for (int x : A) {}
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// No warning, non-reference type indicates copy is made
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for (const double &&x : A) {}
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// No warning, rvalue-reference to the temporary
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for (const double &x : A) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'double'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:21-[[@LINE-3]]:22}:""
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for (const double x : A) {}
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// No warning, non-reference type indicates copy is made
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for (double &&x : A) {}
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// No warning, rvalue-reference to the temporary
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//for (double &x : A) {}
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// Binding error
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for (double x : A) {}
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// No warning, non-reference type indicates copy is made
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for (const Bar &&x : A) {}
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// No warning, rvalue-reference to the temporary
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for (const Bar &x : A) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar x : A) {}
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// No warning, non-reference type indicates copy is made
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for (Bar &&x : A) {}
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// No warning, rvalue-reference to the temporary
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//for (Bar &x : A) {}
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// Binding error
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for (Bar x : A) {}
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// No warning, non-reference type indicates copy is made
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}
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void test2() {
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Container<int&> B;
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//for (const int &&x : B) {}
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// Binding error
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for (const int &x : B) {}
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// No warning, this reference is not a temporary
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for (const int x : B) {}
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// No warning on POD copy
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//for (int &x : B) {}
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// Binding error
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for (int &x : B) {}
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// No warning
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for (int x : B) {}
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// No warning
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for (const double &&x : B) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'double'{{.*}}'const int &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:21-[[@LINE-3]]:23}:""
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for (const double &x : B) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'double'{{.*}}'const int &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:21-[[@LINE-3]]:22}:""
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for (const double x : B) {}
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for (double &&x : B) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'double'{{.*}}'const int &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:15-[[@LINE-3]]:17}:""
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//for (double &x : B) {}
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// Binding error
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for (double x : B) {}
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// No warning
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for (const Bar &&x : B) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
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for (const Bar &x : B) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar x : B) {}
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for (Bar &&x : B) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:14}:""
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//for (Bar &x : B) {}
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// Binding error
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for (Bar x : B) {}
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// No warning
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}
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void test3() {
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Container<Bar> C;
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for (const Bar &&x : C) {}
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// No warning, rvalue-reference to the temporary
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for (const Bar &x : C) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar x : C) {}
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// No warning, non-reference type indicates copy is made
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for (Bar &&x : C) {}
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// No warning, rvalue-reference to the temporary
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//for (Bar &x : C) {}
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// Binding error
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for (Bar x : C) {}
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// No warning, non-reference type indicates copy is made
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for (const int &&x : C) {}
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// No warning, rvalue-reference to the temporary
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for (const int &x : C) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'int'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const int x : C) {}
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// No warning, copy made
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for (int &&x : C) {}
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// No warning, rvalue-reference to the temporary
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//for (int &x : C) {}
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// Binding error
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for (int x : C) {}
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// No warning, copy made
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}
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void test4() {
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Container<Bar&> D;
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//for (const Bar &&x : D) {}
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// Binding error
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for (const Bar &x : D) {}
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// No warning, this reference is not a temporary
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for (const Bar x : D) {}
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// expected-warning@-1 {{creates a copy}}
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// expected-note@-2 {{'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:18}:"&"
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//for (Bar &&x : D) {}
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// Binding error
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for (Bar &x : D) {}
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// No warning
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for (Bar x : D) {}
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// No warning
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for (const int &&x : D) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
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for (const int &x : D) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const int x : D) {}
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// No warning
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for (int &&x : D) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:14}:""
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//for (int &x : D) {}
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// Binding error
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for (int x : D) {}
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// No warning
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}
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void test5() {
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Container<Foo> E;
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for (const Bar &&x : E) {}
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// No warning, rvalue-reference to the temporary
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for (const Bar &x : E) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar x : E) {}
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// No warning, non-reference type indicates copy is made
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for (Bar &&x : E) {}
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// No warning, rvalue-reference to the temporary
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//for (Bar &x : E) {}
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// Binding error
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for (Bar x : E) {}
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// No warning, non-reference type indicates copy is made
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}
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void test6() {
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Container<Foo&> F;
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for (const Bar &&x : F) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
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for (const Bar &x : F) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar x : F) {}
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// No warning.
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for (Bar &&x : F) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:14}:""
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//for (Bar &x : F) {}
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// Binding error
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for (Bar x : F) {}
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// No warning
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}
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void test7() {
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double G[2];
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//for (const double &&x : G) {}
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// Binding error
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for (const double &x : G) {}
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// No warning
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for (const double x : G) {}
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// No warning on POD copy
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//for (double &&x : G) {}
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// Binding error
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for (double &x : G) {}
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// No warning
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for (double x : G) {}
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// No warning
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for (const int &&x : G) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const double &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
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for (const int &x : G) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const double &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const int x : G) {}
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// No warning
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for (int &&x : G) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const double &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:14}:""
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//for (int &x : G) {}
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// Binding error
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for (int x : G) {}
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// No warning
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for (const Bar &&x : G) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const double &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
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for (const Bar &x : G) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const double &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar x : G) {}
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// No warning
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for (Bar &&x : G) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const double &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:14}:""
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//for (Bar &x : G) {}
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// Binding error
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for (Bar x : G) {}
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// No warning
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}
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void test8() {
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Foo H[2];
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//for (const Foo &&x : H) {}
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// Binding error
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for (const Foo &x : H) {}
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// No warning
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for (const Foo x : H) {}
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// No warning on POD copy
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//for (Foo &&x : H) {}
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// Binding error
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for (Foo &x : H) {}
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// No warning
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for (Foo x : H) {}
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// No warning
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for (const Bar &&x : H) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
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for (const Bar &x : H) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar x : H) {}
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// No warning
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for (Bar &&x: H) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:14}:""
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//for (Bar &x: H) {}
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// Binding error
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for (Bar x: H) {}
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// No warning
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}
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void test9() {
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Bar I[2] = {1,2};
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//for (const Bar &&x : I) {}
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// Binding error
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for (const Bar &x : I) {}
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// No warning
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for (const Bar x : I) {}
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// expected-warning@-1 {{creates a copy}}
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// expected-note@-2 {{'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:18}:"&"
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//for (Bar &&x : I) {}
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// Binding error
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for (Bar &x : I) {}
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// No warning
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for (Bar x : I) {}
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// No warning
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for (const int &&x : I) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
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for (const int &x : I) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const int x : I) {}
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// No warning
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for (int &&x : I) {}
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// expected-warning@-1 {{binds to a temporary constructed from}}
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// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:14}:""
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//for (int &x : I) {}
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// Binding error
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for (int x : I) {}
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// No warning
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}
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void test10() {
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Container<Bar> C;
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for (const Bar &x : C) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
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for (const Bar& x : C) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
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// expected-note@-2 {{'Bar'}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:17-[[@LINE-3]]:18}:""
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for (const Bar & x : C) {}
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// expected-warning@-1 {{binds to a temporary value produced by a range}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:20}:""
|
|
|
|
for (const Bar&x : C) {}
|
|
// expected-warning@-1 {{binds to a temporary value produced by a range}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:17-[[@LINE-3]]:18}:" "
|
|
}
|
|
|
|
template <class T>
|
|
void test_template_function() {
|
|
// In a template instantiation the diagnostics should not be emitted for
|
|
// loops with dependent types.
|
|
Container<Bar> C;
|
|
for (const Bar &x : C) {}
|
|
// expected-warning@-1 {{binds to a temporary value produced by a range}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:18-[[@LINE-3]]:19}:""
|
|
|
|
Container<T> Dependent;
|
|
for (const T &x : Dependent) {}
|
|
}
|
|
template void test_template_function<Bar>();
|
|
|
|
template <class T>
|
|
struct test_template_struct {
|
|
static void static_member() {
|
|
Container<Bar> C;
|
|
for (const Bar &x : C) {}
|
|
// expected-warning@-1 {{binds to a temporary value produced by a range}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:20-[[@LINE-3]]:21}:""
|
|
|
|
Container<T> Dependent;
|
|
for (const T &x : Dependent) {}
|
|
}
|
|
|
|
void member() {
|
|
Container<Bar> C;
|
|
for (const Bar &x : C) {}
|
|
// expected-warning@-1 {{binds to a temporary value produced by a range}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:20-[[@LINE-3]]:21}:""
|
|
|
|
Container<T> Dependent;
|
|
for (const T &x : Dependent) {}
|
|
}
|
|
};
|
|
template struct test_template_struct<Bar>;
|
|
|
|
struct test_struct_with_templated_member {
|
|
void member() {
|
|
Container<Bar> C;
|
|
for (const Bar &x : C) {}
|
|
// expected-warning@-1 {{binds to a temporary value produced by a range}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:20-[[@LINE-3]]:21}:""
|
|
}
|
|
|
|
template <class T>
|
|
void template_member() {
|
|
Container<Bar> C;
|
|
for (const Bar &x : C) {}
|
|
// expected-warning@-1 {{binds to a temporary value produced by a range}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:20-[[@LINE-3]]:21}:""
|
|
|
|
Container<T> Dependent;
|
|
for (const T &x : Dependent) {}
|
|
}
|
|
};
|
|
template void test_struct_with_templated_member::template_member<Bar>();
|
|
|
|
#define TEST_MACRO \
|
|
void test_macro() { \
|
|
Container<Bar> C; \
|
|
for (const Bar &x : C) {} \
|
|
}
|
|
|
|
TEST_MACRO
|