fix #20248;fix #6215;turns into simple CT error (#21141)

(cherry picked from commit 40b5c4c4c3)

compiler/semtypes.nim

@@ -320,6 +320,8 @@ proc semRange(c: PContext, n: PNode, prev: PType): PType =
 proc semArrayIndex(c: PContext, n: PNode): PType =
   if isRange(n):
     result = semRangeAux(c, n, nil)
+  elif n.kind == nkInfix and n[0].kind == nkIdent and n[0].ident.s == "..<":
+    result = errorType(c)
   else:
     let e = semExprWithType(c, n, {efDetermineType})
     if e.typ.kind == tyFromExpr:

tests/array/t20248.nim

@@ -0,0 +1,14 @@
+discard """
+cmd: "nim check --hints:off $file"
+errormsg: "ordinal type expected"
+nimout: '''
+t20248.nim(10, 36) Error: ordinal type expected
+t20248.nim(14, 20) Error: ordinal type expected
+'''
+"""
+
+type Vec[N: static[int]] = array[0 ..< N, float]
+
+var v: Vec[32]
+
+var stuff: array[0 ..< 16, int]