Eliminating var-like setter tpe_= on Tree.

Deprecated tpe_= on Tree, which is redundant with and
less useful than setType. To provide a small layer of
insulation from the direct nulling out of mutable fields
used to signal the typer, added def clearType() which is
merely tree.tpe = null but is shamefaced about the null
and var-settings parts like a respectable method should be.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
index 30c12a4286..fe93a0ea76 100644
--- a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
@@ -154,7 +154,7 @@ trait ContextErrors {
         // the found/req types.
         val foundType: Type = req.normalize match {
           case RefinedType(parents, decls) if !decls.isEmpty && found.typeSymbol.isAnonOrRefinementClass =>
-            val retyped    = typed (tree.duplicate setType null)
+            val retyped    = typed (tree.duplicate.clearType())
             val foundDecls = retyped.tpe.decls filter (sym => !sym.isConstructor && !sym.isSynthetic)
             if (foundDecls.isEmpty || (found.typeSymbol eq NoSymbol)) found
             else {
@@ -182,7 +182,7 @@ trait ContextErrors {
       }
 
       def ParentTypesError(templ: Template, ex: TypeError) = {
-        templ.tpe = null
+        templ.clearType()
         issueNormalTypeError(templ, ex.getMessage())
         setError(templ)
       }