c++: improve fold-expr location

I want to distinguish between constraint && and fold-expressions there of
written by the user and those implied by template parameter
type-constraints; to that end, let's improve our EXPR_LOCATION for an
explicit fold-expression.

The fold3.C change is needed because this moves the caret from the end of
the expression to the operator, which means the location of the error refers
to the macro invocation rather than the macro definition; both locations are
still printed, but which one is an error and which a note changes.

gcc/cp/ChangeLog:

	* parser.cc (cp_parser_fold_expression): Track location range.
	* semantics.cc (finish_unary_fold_expr)
	(finish_left_unary_fold_expr, finish_right_unary_fold_expr)
	(finish_binary_fold_expr): Add location parm.
	* constraint.cc (finish_shorthand_constraint): Pass it.
	* pt.cc (convert_generic_types_to_packs): Likewise.
	* cp-tree.h: Adjust.

gcc/testsuite/ChangeLog:

	* g++.dg/concepts/diagnostic3.C: Add expected column.
	* g++.dg/cpp1z/fold3.C: Adjust diagnostic lines.

0 files changed, 0 insertions, 0 deletions