[Issue 19879] std.concurrency: Emit offending field name when failing to spawn() with mutable thread-local data

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19879

--- Comment #2 from Andrej Mitrovic <andrej.mitrovich at gmail.com> ---
Actually I've just noticed it just uses std.traits.hasUnsharedAliasing
internally, so never mind about the last suggestion.

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