f2c8be187e
An ICE on darwin, when a SFINAE-context substitution produced error_mark_node foo an operand of a POINTER_PLUS_EXPR. fold_build_pointer_plus is unprepared to deal with that, so we need to check earlier. We had no luck reducing the testcase to something manageable. * pt.c (tsubst_copy_and_build) [POINTER_PLUS_EXPR]: Check for error_mark_node.
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