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c++: using in diagnostics [PR102987]

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The expression pretty-printing code crashed on a location wrapper with no
type, and didn't know what to do with a USING_DECL.

	PR c++/102987

gcc/cp/ChangeLog:

	* error.cc (dump_expr): Handle USING_DECL.
	[VIEW_CONVERT_EXPR]: Just look through location wrapper.

gcc/testsuite/ChangeLog:

	* g++.dg/diagnostic/using1.C: New test.
This commit is contained in:
Jason Merrill 2022-04-14 17:35:35 -04:00
parent 031bd52e48
commit 6364a39907
2 changed files with 24 additions and 0 deletions
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8
gcc/cp/error.cc
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@ -2203,6 +2203,7 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
case WILDCARD_DECL:
case OVERLOAD:
case TYPE_DECL:
case USING_DECL:
case IDENTIFIER_NODE:
dump_decl (pp, t, ((flags & ~(TFF_DECL_SPECIFIERS|TFF_RETURN_TYPE
|TFF_TEMPLATE_HEADER))
@ -2584,6 +2585,13 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
case VIEW_CONVERT_EXPR:
{
tree op = TREE_OPERAND (t, 0);
if (location_wrapper_p (t))
{
dump_expr (pp, op, flags);
break;
}
tree ttype = TREE_TYPE (t);
tree optype = TREE_TYPE (op);

16
gcc/testsuite/g++.dg/diagnostic/using1.C Normal file
View file

@ -0,0 +1,16 @@
// PR c++/102987
// { dg-do compile { target c++11 } }
struct a {
bool b();
};
template <typename c> struct d : c {
using c::e;
using f = d;
constexpr int g(decltype(e.b())) { return buh; } // { dg-error "buh" }
};
struct h {
a e;
};
using i = d<h>;
auto j = i{}.g(1);