https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78928
Bug ID: 78928 Summary: void(*); accepted in block scope Product: gcc Version: 7.0 Status: UNCONFIRMED Keywords: accepts-invalid Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: rs2740 at gmail dot com Target Milestone: --- From http://stackoverflow.com/q/41326047/2756719. GCC accepts this plainly invalid code: void f() { void(*); } It appears that any combination of ptr-operators within the parentheses is accepted as well.