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Optimize ConstraintSystemBuilderImpl::generateNewBound

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Do not process the bound if it's just the same
This situation can actually happen in case of adding bound
containing type variable itself
This commit is contained in:
Denis Zharkov
2017-10-05 19:11:10 +03:00
parent 3a9650d0fc
commit 082ed62cd5
1 changed files with 2 additions and 1 deletions
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compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/inference/constraintIncorporation.kt
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@@ -82,6 +82,7 @@ private fun ConstraintSystemBuilderImpl.addConstraintFromBounds(old: Bound, new:
} }
private fun ConstraintSystemBuilderImpl.generateNewBound(bound: Bound, substitution: Bound) { private fun ConstraintSystemBuilderImpl.generateNewBound(bound: Bound, substitution: Bound) {
if (bound === substitution) return
// Let's have a bound 'T <=> My<R>', and a substitution 'R <=> Type'. // Let's have a bound 'T <=> My<R>', and a substitution 'R <=> Type'.
// Here <=> means lower_bound, upper_bound or exact_bound constraint. // Here <=> means lower_bound, upper_bound or exact_bound constraint.
// Then a new bound 'T <=> My<_/in/out Type>' can be generated. // Then a new bound 'T <=> My<_/in/out Type>' can be generated.