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f1831fb16a
In Swift 5.4, this worked:
func foo(_: (() throws -> ())? = nil) rethrows {}
foo() // no 'try' needed
However, this was an accident, because this was also accepted:
func foo(_: (() throws -> ())? = { throw ... }) rethrows {}
foo() // 'try' *should* be required here
This got fixed at some point recently, but since people rely on the
old case working for 'nil', let's add back a check for a 'nil'
default parameter.
Fixes rdar://problem/76169080.