https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104752
Bug ID: 104752
Summary: `Concept auto(x)` should not be a valid function-style
cast
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ensadc at mailnesia dot com
CC: mpolacek at gcc dot gnu.org
Target Milestone: ---
https://godbolt.org/z/KbPMrbKsK
====
template<class T>
concept C = true;
auto x = auto(1); // valid (P0849R8)
auto y = C auto(1); // expect a error
====
The initializer of `y` should be an error, but is currently accepted by GCC.
[dcl.type.auto.deduct]:
> For an explicit type conversion ([expr.type.conv]), T is the specified type,
> which shall be auto.
Note that the specified type cannot be 'type-constraint auto'.
GCC does emit an error for `C<> auto(1)`.
