[Issue 20101] BetterC: Template instantiation in CTFE only context should skip codegen / nogc / ... Phases

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20101

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Noting that this worked in the __traits(compiles,...) was the clue I needed.
Thanks!

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