fixes #1343

compiler/vmgen.nim

@@ -1118,7 +1118,6 @@ proc checkCanEval(c: PCtx; n: PNode) =
   # we need to ensure that we don't evaluate 'x' here:
   # proc foo() = var x ...
   let s = n.sym
-  if s.position == 0:
   if s.kind in {skVar, skTemp, skLet, skParam, skResult} and 
       not s.isOwnedBy(c.prc.sym) and s.owner != c.module:
     cannotEval(n)

tests/vm/twrongarray.nim

@@ -0,0 +1,17 @@
+discard """
+  errormsg: "cannot evaluate at compile time: size"
+  line: 16
+"""
+
+#bug #1343
+
+when false:
+  proc one(dummy: int, size: int) =
+    var x: array[size, int] # compile error: constant expression expected
+
+  proc three(size: int) =
+    var x: array[size * 1, int] # compile error: cannot evaluate at compile time: size
+
+proc two(dummy: int, size: int) =
+  var x: array[size * 1, int] # compiles, but shouldn't?
+  #assert(x.len == size) # just for fun

tests/vm/twrongconst.nim

@@ -4,6 +4,6 @@ discard """
 """
 
 var x: array[100, char]
-template Foo : expr = x[42]
+template foo : expr = x[42]
 
 const myConst = foo