[Issue 8262] ICE(mtype.c) alias this to alias of an expression tuple

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=8262

--- Comment #8 from Rainer Schuetze <r.sagitario at gmx.de> ---
https://github.com/D-Programming-Language/dmd/pull/4195

avoids the crash, but doesn't add implicite conversion for tuples.

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