fixes #501

compiler/ccgstmts.nim

@@ -873,4 +873,4 @@ proc genAsgn(p: BProc, e: PNode, fastAsgn: bool) =
 proc genStmts(p: BProc, t: PNode) = 
   var a: TLoc
   expr(p, t, a)
-  InternalAssert a.k in {locNone, locTemp}
+  InternalAssert a.k in {locNone, locTemp, locLocalVar}

tests/compile/tvarious.nim

@@ -22,6 +22,9 @@ proc getPA(): PA =
     b: bool
   b = not false
   return nil
+
+# bug #501
+proc f(): int = result
 
 var
   global: int