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Aviva Ruben
78e42b9d1f
Changes how DiagnosticEngine prints DeclAttribute, to match TypeAttribute. Kind will show attribute or modifier as appropriate, and %0 will quote and include an at sign if appropriate. This prevents diagnostics like `attribute @foo`. Also updates the diagnostic message for unsupported_closure_attr to use this new behavior instead of a select. This updates a ton of tests, to use the new consistent '@foo' or attribute 'foo' style. Many of these diagnostics had %0, and now get quoting automatically, but diagnostics that quoted their attribute needed to be edited.