https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115339
Bug ID: 115339 Summary: Missing -Wpedantic warning for a declarative nested-name-specifier with a decltype-specifier. Product: gcc Version: 15.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: email at miropalmu dot cc Target Milestone: --- Following compiles on a GCC 15.0.0 20240604 without warnings with flags -std=c++26 -Wall -Wextra -Wpedantic (https://godbolt.org/z/6fdbo9YcW): ``` struct X { struct a; }; auto x = X{}; struct decltype(x)::a{}; ``` However it should be ill-formed or at least give warning with -Wpedantic, as [expr.prim.id.general] states (https://eel.is/c++draft/expr.prim.id#qual-2): > A declarative nested-name-specifier shall not have a decltype-specifier. `decltype(x)` is declarative nested-name-specifier as it is part of class-head-name.