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Chris Tate
2fbc08e36d
The references of a cycle class were found by their spelling, so a class
imported under another name (`import { Sink as Alias }`) was never seen as
reached early, and neither was a let or const imported under another
name. An `extends` clause only counted when its expression was the bare
class name. A static method read as a value (`const f = Sink.m`) built a
closure that no check covered.
The early-binding scan and the class reference scan now also match each
file's local import names that resolve to the binding, and record them:
Node's ReferenceError names the binding the access spells, so the check
names the alias. The heritage check walks the whole `extends` expression.
A closure of a flagged class's static method checks the class like a
static call does.