[Issue 12569] Better error message for std.algorithm.reduce used with two functions and a scalar seed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12569

--- Comment #2 from bearophile_hugs at eml.cc ---
(In reply to monarchdodra from comment #1)

> Currently, in HEAD, this code ices the compiler.

I have filed it as Issue 12574

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