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Map Carbon value expressions to const-qualified C++ prvalues. (#6880)

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In C++ overload resolution, when mapping a Carbon value expression into
a C++ argument, produce a const-qualified argument where possible. This
has two effects:

* Overload resolution does not consider non-const-qualified member
functions to be viable for a prvalue self any more. This is desirable
since such functions are not actually callable with a prvalue self, and
permits overload resolution to pick a const-qualified overload instead.

* Overload resolution does not allow a Carbon value expression to be
passed to a C++ `T&&` parameter any more. This is desirable since it's
not correct to move from a value expression. Previously we allowed this
and moved from the value!
This commit is contained in:
Richard Smith
2026-03-11 03:42:19 +00:00
committed by GitHub
parent ba6257891e
commit 39fd358059
5 changed files with 164 additions and 166 deletions
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toolchain/check/testdata/interop/cpp/function/operators.carbon
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@@ -283,7 +283,7 @@ void operator+(C, short);
''';
fn Test(c: Cpp.C) {
// CHECK:STDERR: fail_ambiguous.carbon:[[@LINE+10]]:5: error: use of overloaded operator '+' is ambiguous (with operand types 'C' and 'int') [CppInteropParseError]
// CHECK:STDERR: fail_ambiguous.carbon:[[@LINE+10]]:5: error: use of overloaded operator '+' is ambiguous (with operand types 'const C' and 'int') [CppInteropParseError]
// CHECK:STDERR: 21 | c + 1;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_ambiguous.carbon:[[@LINE-8]]:6: note: candidate function [CppInteropParseNote]