InterpolatedString.postfixType
char postfixType() inout pure nothrow @nogc @safe scope'\0'/'c'/'w'/'d' for i"", i""c, i""w and i""d respectively.
char postfixType() inout pure nothrow @nogc @safe scope'\0'/'c'/'w'/'d' for i"", i""c, i""w and i""d respectively.