ios - Generic Swift struct: Segmentation fault: 11 -

i trying implement struct generic type conforms hashable protocol. can me understand why getting "segmentation fault: 11" error following code.

i appreciate insights regarding this.

struct pmf<element: hashable> {     typealias distribution = [element : float]     fileprivate var normalized = false      fileprivate var distribution:[element : float] = [ : ] {         didset {             self.normalized = false         }    } }  extension pmf {     init(values: [element], withprobs probs: [float]) {         pair in zip(values, probs) {             self.distribution[pair.0] = pair.1         }     }      var probdist: distribution {         mutating {             if !normalized {                 self.normalize()             }             return self.distribution         }     }      subscript(value: element) -> float? {         mutating {             if !normalized {                 self.normalize()             }             return self.distribution[value]         }         set(prob) {             self.distribution[value] = prob         }     }     mutating func normalize() {         (key, val) in self.distribution {             self.distribution[key] = val / float(self.distribution.count)         }     } }  var pp = pmf<string>()  pp["one"] = 4 pp["two"] = 5 pp["three"] = 5  print(pp) 

seems need little trick define initializer value type in extension:

add 1 line init(values:withprobs:) shown below:

init(values: [element], withprobs probs: [float]) {     self.init() //<-     pair in zip(values, probs) {         self.distribution[pair.0] = pair.1     } } 

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anyway compilers should not crash segfault 11. if source code has fault in it.

you'd better send bug report apple, or swift.org.