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Short-circuit for equal terms.

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This commit is contained in:
Rob Rix 2015-09-29 12:54:32 -04:00
parent 7d36421d6a
commit dfbfb9fe79
1 changed files with 4 additions and 0 deletions
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4
prototype/Doubt/Diff.swift
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@ -46,6 +46,10 @@ public enum Diff: Comparable, CustomDebugStringConvertible, CustomDocConvertible
}
public init(_ a: Term, _ b: Term) {
if a == b {
self = Diff(b)
return
}
switch (a.syntax, b.syntax) {
case (.Empty, .Empty):
self = .Copy(.Empty)