https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105106
Bug ID: 105106
Summary: Dependent invocation with defaulted NTTP lambda fails
Product: gcc
Version: 9.4.1
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: johelegp at gmail dot com
Target Milestone: ---
See https://godbolt.org/z/obfY3Mdba:
```C++
template <auto l = []{}>
auto foo() {
return l;
}
template <class>
auto bar() {
return foo();
}
```
The error message looks cut short:
```
<source>: In function 'auto bar()':
<source>:8:16: error: no matching function for call to 'foo()'
8 | return foo();
| ^
<source>:2:6: note: candidate: 'template<auto l> auto foo()'
2 | auto foo() {
| ^~~
<source>:2:6: note: template argument deduction/substitution failed:
```
