[Issue 15459] [REG2.065.0] stdin.byLine.each!(map!somefunc) compiles, fails to link with ld

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https://issues.dlang.org/show_bug.cgi?id=15459

--- Comment #13 from Walter Bright <bugzi...@digitalmars.com> ---
The Comment 6 example still fails to compile. It looks like the speculative
compilation in the `is(typeof(map))` wound up hiding the error in somefunc().

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