20 lines
1.1 KiB
Diff
20 lines
1.1 KiB
Diff
# UNDF: UNDF-2026-000000270
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diff --git a/src/compiler/scala/tools/nsc/typechecker/Checkable.scala b/src/compiler/scala/tools/nsc/typechecker/Checkable.scala
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index abcdef00..cwe407fix 100644
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--- a/src/compiler/scala/tools/nsc/typechecker/Checkable.scala
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+++ b/src/compiler/scala/tools/nsc/typechecker/Checkable.scala
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@@ -98,7 +98,11 @@ trait Checkable {
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def propagateKnownTypes(from: Type, to: Symbol): Type = {
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def tparams = to.typeParams
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val tvars = tparams map (p => TypeVar(p))
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val tvarType = appliedType(to, tvars)
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+ // CWE-407 fix: convert to.baseClasses to a Set before the outer foreach.
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+ // Previously: from.baseClasses foreach { bc => if (to.baseClasses.contains(bc))
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+ // was O(M×N) where M=|from.baseClasses|, N=|to.baseClasses| — both are List[Symbol].
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+ // Symbol equality is reference identity so Set[Symbol] is O(1) contains.
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+ val toBaseSet = to.baseClasses.toSet
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- from.baseClasses foreach { bc => if (to.baseClasses.contains(bc)){
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+ from.baseClasses foreach { bc => if (toBaseSet.contains(bc)){
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val tps1 = (from baseType bc).typeArgs
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val tps2 = (tvarType baseType bc).typeArgs
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