improve error message for twrongcolon

compiler/parser.nim

@@ -914,7 +914,7 @@ proc parseIdentColonEquals(p: var TParser, flags: TDeclaredIdentFlags): PNode =
     optInd(p, result)
     addSon(result, parseTypeDesc(p))
   else:
-    addSon(result, ast.emptyNode)
+    addSon(result, newNodeP(nkEmpty, p))
     if p.tok.tokType != tkEquals and withBothOptional notin flags:
       parMessage(p, errColonOrEqualsExpected, p.tok)
   if p.tok.tokType == tkEquals:
@@ -922,7 +922,7 @@ proc parseIdentColonEquals(p: var TParser, flags: TDeclaredIdentFlags): PNode =
     optInd(p, result)
     addSon(result, parseExpr(p))
   else:
-    addSon(result, ast.emptyNode)
+    addSon(result, newNodeP(nkEmpty, p))
 
 proc parseTuple(p: var TParser, indentAllowed = false): PNode =
   #| inlTupleDecl = 'tuple'

compiler/semcall.nim

@@ -277,9 +277,9 @@ proc resolveOverloads(c: PContext, n, orig: PNode,
 
     if overloadsState == csEmpty and result.state == csEmpty:
       if nfDotField in n.flags and nfExplicitCall notin n.flags:
-        localError(n.info, errUndeclaredField, considerQuotedIdent(f).s)
+        localError(n.info, errUndeclaredField, considerQuotedIdent(f, n).s)
       else:
-        localError(n.info, errUndeclaredRoutine, considerQuotedIdent(f).s)
+        localError(n.info, errUndeclaredRoutine, considerQuotedIdent(f, n).s)
       return
     elif result.state != csMatch:
       if nfExprCall in n.flags:

tests/errmsgs/twrongcolon.nim

@@ -0,0 +1,11 @@
+discard """
+errormsg: "in expression '("
+nimout: '''
+Error: in expression '(
+  890)': identifier expected, but found ''
+'''
+
+line: 11
+"""
+
+var n: int : 890