diff options
Diffstat (limited to 'src')
-rw-r--r-- | src/compiler/scala/reflect/internal/Types.scala | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/src/compiler/scala/reflect/internal/Types.scala b/src/compiler/scala/reflect/internal/Types.scala index 02e11ddd59..a839e44182 100644 --- a/src/compiler/scala/reflect/internal/Types.scala +++ b/src/compiler/scala/reflect/internal/Types.scala @@ -749,12 +749,18 @@ trait Types extends api.Types { self: SymbolTable => def substThis(from: Symbol, to: Symbol): Type = substThis(from, to.thisType) - /** Performs both substThis and substSym in one traversal. + /** Performs both substThis and substSym, in that order. + * + * [JZ] Reverted `SubstThisAndSymMap` from 334872, which was not the same as + * `substThis(from, to).substSym(symsFrom, symsTo)`. + * + * `SubstThisAndSymMap` performs a breadth-first map over this type, which meant that + * symbol substitution occured before `ThisType` substitution. Consequently, in substitution + * of a `SingleType(ThisType(`from`), sym), symbols were rebound to `from` rather than `to`. */ - def substThisAndSym(from: Symbol, to: Type, symsFrom: List[Symbol], symsTo: List[Symbol]): Type = { + def substThisAndSym(from: Symbol, to: Type, symsFrom: List[Symbol], symsTo: List[Symbol]): Type = if (symsFrom eq symsTo) substThis(from, to) - else new SubstThisAndSymMap(from, to, symsFrom, symsTo) apply this - } + else substThis(from, to).substSym(symsFrom, symsTo) /** Returns all parts of this type which satisfy predicate `p` */ def filter(p: Type => Boolean): List[Type] = new FilterTypeCollector(p) collect this @@ -4518,13 +4524,6 @@ trait Types extends api.Types { self: SymbolTable => case _ => mapOver(tp) } } - class SubstThisAndSymMap(fromThis: Symbol, toThis: Type, fromSyms: List[Symbol], toSyms: List[Symbol]) - extends SubstSymMap(fromSyms, toSyms) { - override def apply(tp: Type): Type = tp match { - case ThisType(sym) if sym == fromThis => apply(toThis) - case _ => super.apply(tp) - } - } class SubstWildcardMap(from: List[Symbol]) extends TypeMap { def apply(tp: Type): Type = try { |