Implement short-form PLACE, and fix PLACE IN WORKSPACE/VECSPACE.

LANGUAGE

@@ -16,6 +16,8 @@ Intrinsics:
 - SQRT
 - DSQRT
 
+CHAN for CHAN OF, and PLACE for PLACE AT.
+
 PLACE IN WORKSPACE and PLACE IN VECSPACE, both currently ignored.
 
 INITIAL variables.

frontends/ParseOccam.hs

@@ -1258,8 +1258,7 @@ allocation
 
 placement :: OccParser A.Placement
 placement
-    =   do sAT
-           e <- intExpr
+    =   do e <- tryXV (optional sAT) intExpr
            return $ A.PlaceAt e
     <|> do tryXX sIN sWORKSPACE
            return $ A.PlaceInWorkspace

testcases/place.occ

@@ -7,5 +7,7 @@ PROC P ()
   PLACE w IN WORKSPACE:
   INT v:
   PLACE v IN VECSPACE:
+  INT new:
+  PLACE new #123456:
   SKIP
 :