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This rule does not seem to be widely followed by Clang today. Looking at Parser and Sema, many getters (0 argument functions with names matching /^get[A-Z]/) return mutable references to long-lived objects. Looking through Decl.h, things are a little different: we rarely return references, but do frequently return pointers that provide mutable access to contained objects. On Tue, Mar 4, 2014 at