Hi all

I've been wanting to have support for interpolated strings in D for some time now that will allow you to write e.g.:

auto a = 7;
writeln( $"{a} times 3 is {a*3}" );

Code speaks louder that words so I've made a PR that adds this support to ddmd as a RFC [1].

The compiler will basically lower the $"..." string to a mixin that concatenates the expression parts of the (inside the {}) and the plain text parts.

I do recognize that this is not part of the 2017 H1 plan but I also believe such smaller improvements added regularly can make the language both more productive and attractive.

In case this addition gets a thumbs up I will of course improve test coverage and any needed quality of implementation.

[1] https://github.com/dlang/dmd/pull/6703

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