https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127249
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2026-09-07
Status|UNCONFIRMED |NEW
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Clang gets the location right:
def.cc:6:11: error: no matching constructor for initialization of 'NoDefault'
6 | Foo() : T(), inner() { }
| ^
def.cc:13:18: note: in instantiation of member function 'Foo<NoDefault>::Foo'
requested here
13 | Foo<NoDefault> f;
| ^
def.cc:9:20: note: candidate constructor not viable: requires 1 argument, but 0
were provided
9 | struct NoDefault { NoDefault(int) { } };
| ^ ~~~
def.cc:9:8: note: candidate constructor (the implicit copy constructor) not
viable: requires 1 argument, but 0 were provided
9 | struct NoDefault { NoDefault(int) { } };
| ^~~~~~~~~
def.cc:9:8: note: candidate constructor (the implicit move constructor) not
viable: requires 1 argument, but 0 were provided
9 | struct NoDefault { NoDefault(int) { } };
| ^~~~~~~~~
1 error generated.
So does EDG:
"def.cc", line 6: error: no instance of constructor "NoDefault::NoDefault"
matches the argument list
Foo() : T(), inner() { }
^
"def.cc", line 9: note: number of parameters of function
"NoDefault::NoDefault(const NoDefault &)" does not match the call
struct NoDefault { NoDefault(int) { } };
^
"def.cc", line 9: note: number of parameters of function
"NoDefault::NoDefault(NoDefault &&)" does not match the call
struct NoDefault { NoDefault(int) { } };
^
"def.cc", line 9: note: number of parameters of function
"NoDefault::NoDefault(int)" does not match the call
struct NoDefault { NoDefault(int) { } };
^
detected during instantiation of "Foo<T, U...>::Foo() [with
T=NoDefault, U=<>]" at line 13
1 error detected in the compilation of "def.cc".
