[Issue 20388] Parse error when compiling lambdas in mixins as template parameters

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20388

--- Comment #3 from RazvanN <razvan.nitu1305 at gmail.com> ---
A partial solution that may solve other cases would be to treat string mixins
at parse time. Once the parser determines that the mixin is a string it can
ignore the mixin part and simply paste the string.

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