False negative "mutated but not read" when read is RHS of assign #24280
Description
Compiler version
3.3.7
Minimized code
class Foo {
def foo(): Any = {
var i = 0 // <- warning here
val f = () => i += 1
f
}
}Output
[warn] -- [E198] Unused Symbol Warning: .../ThunkSuite.scala:3:8
[warn] 3 | var i = 0
[warn] | ^
[warn] | unused local definitionExpectation
No warning (as i is not unused; in fact, if I remove i, that results in an error).
Related: typelevel/cats-effect#4519