https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127249
Bug ID: 127249
Summary: Wrong caret location for invalid mem-initializer
Product: gcc
Version: 15.3.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
template<typename T, typename... U>
struct Foo : T
{
int inner;
Foo() : T(), inner() { }
};
struct NoDefault { NoDefault(int) { } };
int main()
{
Foo<NoDefault> f;
}
This code is ill-formed, but the location is unhelpful:
def.cc: In instantiation of 'Foo<T, U>::Foo() [with T = NoDefault; U = {}]':
def.cc:13:18: required from here
13 | Foo<NoDefault> f;
| ^
def.cc:6:22: error: no matching function for call to 'NoDefault::NoDefault()'
6 | Foo() : T(), inner() { }
| ^
* there are 3 candidates
* candidate 1: 'NoDefault::NoDefault(int)'
def.cc:9:20:
9 | struct NoDefault { NoDefault(int) { } };
| ^~~~~~~~~
* candidate expects 1 argument, 0 provided
* candidate 2: 'constexpr NoDefault::NoDefault(const NoDefault&)'
def.cc:9:8:
9 | struct NoDefault { NoDefault(int) { } };
| ^~~~~~~~~
* candidate expects 1 argument, 0 provided
* candidate 3: 'constexpr NoDefault::NoDefault(NoDefault&&)'
* candidate expects 1 argument, 0 provided
The error line points to inner() but the problem is T(). This is quite
confusing in a complicated template where there are lots of types involved.
