fixes a parser bug

compiler/parser.nim

@@ -1238,10 +1238,7 @@ proc parseExprStmt(p: var TParser): PNode =
         addSon(result, e)
         if p.tok.tokType != tkComma: break
     elif p.tok.indent < 0 and isExprStart(p):
-      if a.kind == nkCommand:
-        result = a
-      else:
-        result = newNode(nkCommand, a.info, @[a])
+      result = newNode(nkCommand, a.info, @[a])
       while true:
         var e = parseExpr(p)
         addSon(result, e)

tests/parser/twrongcmdsyntax.nim

@@ -0,0 +1,6 @@
+discard """
+  errormsg: '''identifier expected, but found 'echo 4'''
+  line: 6
+"""
+
+echo 4 +2