Reusable is not thread-safe

som-snytt · dwijnand · commit f46a4a33d79a · 2021-05-11T15:34:59.000+01:00
diff --git a/src/reflect/scala/reflect/internal/Symbols.scala b/src/reflect/scala/reflect/internal/Symbols.scala
@@ -3771,7 +3771,7 @@ trait Symbols extends api.Symbols { self: SymbolTable =>
     }
 
   private[this] val cloneSymbolsSubstSymMap: ReusableInstance[SubstSymMap] =
-    ReusableInstance[SubstSymMap](SubstSymMap())
+    ReusableInstance[SubstSymMap](SubstSymMap(), enabled = isCompilerUniverse)
 
   def cloneSymbolsAtOwner(syms: List[Symbol], owner: Symbol): List[Symbol] =
     deriveSymbols(syms, _ cloneSymbol owner)
diff --git a/src/reflect/scala/reflect/internal/Types.scala b/src/reflect/scala/reflect/internal/Types.scala
@@ -4042,7 +4042,7 @@ trait Types
     refinedType(parents, owner, newScope, owner.pos)
 
   private[this] val copyRefinedTypeSSM: ReusableInstance[SubstSymMap] =
-    ReusableInstance[SubstSymMap](SubstSymMap())
+    ReusableInstance[SubstSymMap](SubstSymMap(), enabled = isCompilerUniverse)
 
   def copyRefinedType(original: RefinedType, parents: List[Type], decls: Scope) =
     if ((parents eq original.parents) && (decls eq original.decls)) original

Original file line number	Diff line number	Diff line change
`@@ -3771,7 +3771,7 @@ trait Symbols extends api.Symbols { self: SymbolTable =>`
`3771`	`3771`	`}`
`3772`	`3772`
`3773`	`3773`	`private[this] val cloneSymbolsSubstSymMap: ReusableInstance[SubstSymMap] =`
`3774`		`- ReusableInstance[SubstSymMap](SubstSymMap())`
	`3774`	`+ ReusableInstance[SubstSymMap](SubstSymMap(), enabled = isCompilerUniverse)`
`3775`	`3775`
`3776`	`3776`	`def cloneSymbolsAtOwner(syms: List[Symbol], owner: Symbol): List[Symbol] =`
`3777`	`3777`	`deriveSymbols(syms, _ cloneSymbol owner)`