Fix #14911 (#14922) [backport]

* Fix #14911

* Add testcase

* Fix test

compiler/semexprs.nim

@@ -2432,7 +2432,7 @@ proc checkPar(c: PContext; n: PNode): TParKind =
     for i in 0..<n.len:
       if result == paTupleFields:
         if (n[i].kind != nkExprColonExpr) or
-            n[i][0].kind notin {nkSym, nkIdent}:
+            n[i][0].kind notin {nkSym, nkIdent, nkAccQuoted}:
           localError(c.config, n[i].info, errNamedExprExpected)
           return paNone
       else:

tests/tuples/ttuples_issues.nim

@@ -1,5 +1,7 @@
 discard """
-output: '''
+output: '''(a: 1)
+(a: 1)
+(a: 1, b: 2)
 '''
 """
 
@@ -75,3 +77,8 @@ block t1986:
     (var1: test(), var2: 100'u32),
     (var1: test(), var2: 192'u32)
   ]
+
+# bug #14911
+echo (a: 1)  # works
+echo (`a`: 1)  # works
+echo (`a`: 1, `b`: 2)  # Error: named expression expected