redo fix for #4035

compiler/parser.nim

@@ -807,7 +807,8 @@ proc parseOperators(p: var TParser, headNode: PNode,
     var a = newNodeP(nkInfix, p)
     var opNode = newIdentNodeP(p.tok.ident, p) # skip operator:
     getTok(p)
-    optInd(p, a)
+    flexComment(p, a)
+    optPar(p)
     # read sub-expression with higher priority:
     var b = simpleExprAux(p, opPrec + leftAssoc, modeB)
     addSon(a, opNode)