[Issue 18199] Error with lambda in struct initializer

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18199

--- Comment #4 from John Belmonte <john at neggie.net> ---
The problem stems from the presence of the "return" token in the lambda
expression, not the curly brackets.

parseInitializer() scans ahead to see if there is a struct initializer (in
curly brackets).  However the scan is aborted when the return token is hit.

https://github.com/dlang/dmd/blob/4244b8b1abea8ad26941c33464780a13f554b0bf/src/dmd/parse.d#L6043

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