Swift: Compiler crashes with recursive functions returning functions

Originator:rix.rob
Number:rdar://18495979 Date Originated:29-Sep-2014 08:58 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode-6.1 (6A1042b)
Classification:Serious Bug Reproducible:Always
 
Summary:
A recursive function returning a function crashes the compiler.


Steps to Reproduce:
1. Compile this code:
struct A {
	func g<U>(recur: (A, U) -> U) -> (A, U) -> U {
		return { _, x in return x }
	}
	func f() {
		let recur: (A, A) -> A = { c, x in x }
		let b = g(recur)(self, self)
	}
}


Expected Results:
No crash.


Actual Results:
Crash.


Regression:
- If you don’t call g(), it doesn’t crash.
- If you use curried function syntax to define g, it doesn’t crash.


Notes:
Crash log to follow.

Comments


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