explicitly disallow using
in ambient contexts
#61781
Merged
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Since it first supported ERM, the compiler has shunned ambient
using
:declare [await] using
is invalid, and variables appearing in the declaration emit are converted toconst
.However, there is a blind spot in the checker, and that is when a variable declaration occurs in already-ambient context:
Technically this doesn't apply to
await using
, as the checker will already complain about an invalid await context, but this PR adds errors on both for consistency.Closes #61752.