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duplicates arguments to macro typer APIs
This commit continues the tendency set by the parent commit to duplicate as much as possible in order to avoid potential confusion that users might run into when compiler internals start leaking. Here we plumb another way that by-reference sharing of trees might bite unsuspecting macro writers. Previously we have duplicated macro expansions, macro arguments, c.macroApplication, and now it’s arguments to typeCheck and resetAttrs. There is still an unlikely situation when someone gets to c.enclosingXXX and then starts typechecking around, but that’s left for future work, as it’s yet unclear what to do with c.enclosingXXX APIs.
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