[Issue 18439] Error: cannot use operator ~= in @nogc delegate 'main.test.__lambda1'

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18439

--- Comment #4 from Seb <greensunny12 at gmail.com> ---
I looked a bit at this and there seem to be two issues going on:

1) DMD creates the __lambda1 member
For this in @nogc main case (i.e. without label), TypeFunction.isnogc = false
-> initInferAttributes tries to infer the attributes of the lambdas and infers
it to be not @nogc
For this @nogc: main case (i.e. with the label), TypeFunction.isnogc = true
-> setGC returns true -> failure on CatAssign

2) The __lambda1 uses a CatAssign (probably from CTFE?) and that's checked even
though it never makes it to the codegen.

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