https://bugs.llvm.org/show_bug.cgi?id=44673
Bug ID: 44673
Summary: Rejects valid code with constructor accepting
constrained auto parameter when the concept name is
namespace qualified and has an explicit template
argument
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: da...@doublewise.net
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
The following well-formed code
```
namespace n {
template<typename, typename>
concept c = true;
}
struct s {
s(n::c<int> auto);
};
auto x = s(0);
```
is rejected by clang with the message
```
<source>:9:17: error: expected ')'
s(n::c<int> auto);
^
<source>:9:6: note: to match this '('
s(n::c<int> auto);
^
<source>:9:10: error: non-friend class member 'c' cannot have a qualified name
s(n::c<int> auto);
~~~^
<source>:9:10: error: field has incomplete type 's'
<source>:8:8: note: definition of 's' is not complete until the closing '}'
struct s {
^
<source>:12:10: error: no matching conversion for functional-style cast from
'int' to 's'
auto x = s(0);
^~~
<source>:8:8: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'int' to 'const s' for 1st argument
struct s {
^
<source>:8:8: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'int' to 's' for 1st argument
struct s {
^
<source>:8:8: note: candidate constructor (the implicit default constructor)
not viable: requires 0 arguments, but 1 was provided
4 errors generated.
Compiler returned: 1
```
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