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Da Xie authored
Add check for constrained auto type specifier in function declaration or
function type declaration with trailing return type. Issue error if such
usage is detected.

Test file renamed, and added a new test for type declaration.

Successfully bootstrapped and regretested on x86_64-pc-linux-gnu:
Added 6 passed and 4 unsupported tests.

	PR c++/100589

gcc/cp/ChangeLog:

	* decl.cc (grokdeclarator): Issue an error for a declarator with
	constrained auto type specifier and trailing return types. Include
	function names if available.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/concepts-pr100589.C: New test.

Signed-off-by: default avatarDa Xie <xxie_xd@163.com>
Reviewed-by: default avatarPatrick Palka <ppalka@redhat.com>
Reviewed-by: default avatarJason Merrill <jason@redhat.com>
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