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PR c++/89630 - ICE with dependent using-decl as template arg.

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Even though these two using-declarations have the same effect, they are not
the same declaration, and we don't need to work to treat them as the same
like we do for typedefs.  If we did need to, we would need to handle them
specially in iterative_hash_template_arg as well as here.

	* tree.c (cp_tree_equal): Always return false for USING_DECL.

From-SVN: r269777
This commit is contained in:
Jason Merrill 2019-03-18 15:37:00 -04:00 committed by Jason Merrill
parent d849cfaeea
commit 7834e5a0e1
2 changed files with 4 additions and 8 deletions
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3
gcc/cp/ChangeLog
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@ -1,5 +1,8 @@
2019-03-18 Jason Merrill <jason@redhat.com>
PR c++/89630 - ICE with dependent using-decl as template arg.
* tree.c (cp_tree_equal): Always return false for USING_DECL.
PR c++/89761 - ICE with sizeof... in pack expansion.
* pt.c (argument_pack_element_is_expansion_p): Handle
ARGUMENT_PACK_SELECT.

9
gcc/cp/tree.c
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@ -3661,6 +3661,7 @@ cp_tree_equal (tree t1, tree t2)
case TEMPLATE_DECL:
case IDENTIFIER_NODE:
case SSA_NAME:
case USING_DECL:
return false;
case BASELINK:
@ -3787,14 +3788,6 @@ cp_tree_equal (tree t1, tree t2)
DEFERRED_NOEXCEPT_ARGS (t2)));
break;
case USING_DECL:
if (DECL_DEPENDENT_P (t1) && DECL_DEPENDENT_P (t2))
return (cp_tree_equal (USING_DECL_SCOPE (t1),
USING_DECL_SCOPE (t2))
&& cp_tree_equal (DECL_NAME (t1),
DECL_NAME (t2)));
return false;
case LAMBDA_EXPR:
/* Two lambda-expressions are never considered equivalent. */
return false;