[Issue 20954] spawn in unitest: compiler error, confusing message

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20954

mw <mingwu at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from mw <mingwu at gmail.com> ---
need to add static to all the functions, including those called by the spawned
functions:

static void safePrint(T...)(T args)

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