printNoGC

Buils a message to a buffer similarly to writef/writefln, but without using GC.

C snprintf would be better, but it isn't pure. formattedWrite isn't completely @nogc yet (although it isn't GC-heavy).

The user has to ensure buffer is long enough - an assert checks that we don't run out of space. Currently this can only write strings and dchars.

char[]
printNoGC
@safe pure nothrow @nogc
(
S...
)
(
char[] buffer
,
)

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