29d8838c5e
This is an ICE-on-invalid, but I keep seeing it when reducing code so
I'd like to fix it. We crash on
template <typename> void forward() {
concept C = true;
}
which breaks two requirements:
[temp.concept]/1: A concept is a template ...
[temp.concept]/3: A concept-definition shall inhabit a namespace scope.
This patch adds a test that exercises broken code and fixes the ICE
by checking that a concept-definition is defined at namespace scope.
gcc/cp/ChangeLog:
PR c++/97536
* decl.c (grokvardecl): Given an error when a concept is not defined
at namespace scope.
gcc/testsuite/ChangeLog:
PR c++/97536
* g++.dg/concepts/diagnostic16.C: New test.
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