SI-7345 Factor out method to clear and restore undetparams.

Also refactored `handleOverloaded` to avoid use of a mutable Buffer

1 files changed, 14 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/nsc/typechecker/Contexts.scala b/src/compiler/scala/tools/nsc/typechecker/Contexts.scala
index dd43e22159..ae1ff24e76 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Contexts.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Contexts.scala
@@ -262,6 +262,20 @@ trait Contexts { self: Analyzer =>
       tparams
     }
 
+    /** Run `body` with this context with no undetermined type parameters, restore the original
+     *  the original list afterwards.
+     *  @param reportAmbiguous Should ambiguous errors be reported during evaluation of `body`?
+     */
+    def savingUndeterminedTypeParams[A](reportAmbiguous: Boolean = ambiguousErrors)(body: => A): A = {
+      withMode() {
+        this(AmbiguousErrors) = reportAmbiguous
+        val savedParams = extractUndetparams()
+        try body
+        finally {
+          undetparams = savedParams
+        }
+      }
+    }
     //
     // Error reporting policies and buffer.
     //