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Fixes #2622, where it was discovered that global variables annotated as
@global
may not yet have been initialized when used, leading to subtle issues.Turns out that the underlying problem is even broader, in that uses of global variables currently unconditionally compile these and their initializers out-of-band, possibly leading to subtle side-effects like the one seen in imported files declaring a
@global
variable. Hence this PR adds a check whenever a global is to be compiled lazily, and unless the global is annotated as@lazy
, is built-in or ambient (where order is not relevant), diagnoses uses before their declaration.cc @HerrCai0907, as this also supersedes #2624.