Fix missing parsingContext restore at return in parseDelimitedList (microsoft#48999)

Author: jakebailey

src/compiler/parser.ts

@@ -2745,6 +2745,7 @@ namespace ts {
                     const startPos = scanner.getStartPos();
                     const result = parseListElement(kind, parseElement);
                     if (!result) {
+                        parsingContext = saveParsingContext;
                         return undefined;
                     }
                     list.push(result as NonNullable<T>);

tests/baselines/reference/parserUnparsedTokenCrash1.errors.txt

@@ -0,0 +1,11 @@
+tests/cases/compiler/a.js(1,9): error TS1005: ')' expected.
+tests/cases/compiler/a.js(1,13): error TS1005: ';' expected.
+
+
+==== tests/cases/compiler/a.js (2 errors) ====
+    ( y = 1 ; 2 )
+            ~
+!!! error TS1005: ')' expected.
+                ~
+!!! error TS1005: ';' expected.
+    

tests/baselines/reference/parserUnparsedTokenCrash1.js

@@ -0,0 +1,7 @@
+//// [a.js]
+( y = 1 ; 2 )
+
+
+//// [a.js]
+(y = 1);
+2;

tests/baselines/reference/parserUnparsedTokenCrash1.symbols

@@ -0,0 +1,4 @@
+=== tests/cases/compiler/a.js ===
+( y = 1 ; 2 )
+No type information for this code.
+No type information for this code.

tests/baselines/reference/parserUnparsedTokenCrash1.types

@@ -0,0 +1,8 @@
+=== tests/cases/compiler/a.js ===
+( y = 1 ; 2 )
+>( y = 1 : 1
+>y = 1 : 1
+>y : any
+>1 : 1
+>2 : 2
+

tests/baselines/reference/parserUnparsedTokenCrash2.errors.txt

@@ -0,0 +1,30 @@
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(1,10): error TS1109: Expression expected.
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(1,12): error TS2304: Cannot find name 'x'.
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(1,16): error TS2364: The left-hand side of an assignment expression must be a variable or a property access.
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(1,18): error TS2304: Cannot find name 'y'.
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(1,22): error TS2304: Cannot find name 'z'.
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(1,27): error TS1109: Expression expected.
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(1,39): error TS1005: ';' expected.
+tests/cases/compiler/parserUnparsedTokenCrash2.ts(2,1): error TS1005: '}' expected.
+
+
+==== tests/cases/compiler/parserUnparsedTokenCrash2.ts (8 errors) ====
+    export = } x = ( y = z ==== 'function') {
+             ~
+!!! error TS1109: Expression expected.
+               ~
+!!! error TS2304: Cannot find name 'x'.
+                   ~~~~~~~~~~~
+!!! error TS2364: The left-hand side of an assignment expression must be a variable or a property access.
+                     ~
+!!! error TS2304: Cannot find name 'y'.
+                         ~
+!!! error TS2304: Cannot find name 'z'.
+                              ~
+!!! error TS1109: Expression expected.
+                                          ~
+!!! error TS1005: ';' expected.
+    
+    
+!!! error TS1005: '}' expected.
+!!! related TS1007 tests/cases/compiler/parserUnparsedTokenCrash2.ts:1:41: The parser expected to find a '}' to match the '{' token here.

tests/baselines/reference/parserUnparsedTokenCrash2.js

@@ -0,0 +1,10 @@
+//// [parserUnparsedTokenCrash2.ts]
+export = } x = ( y = z ==== 'function') {
+
+
+//// [parserUnparsedTokenCrash2.js]
+"use strict";
+x = (y = z === ) = 'function';
+{
+}
+module.exports = ;

tests/baselines/reference/parserUnparsedTokenCrash2.symbols

@@ -0,0 +1,4 @@
+=== tests/cases/compiler/parserUnparsedTokenCrash2.ts ===
+export = } x = ( y = z ==== 'function') {
+No type information for this code.
+No type information for this code.

tests/baselines/reference/parserUnparsedTokenCrash2.types

@@ -0,0 +1,14 @@
+=== tests/cases/compiler/parserUnparsedTokenCrash2.ts ===
+export = } x = ( y = z ==== 'function') {
+> : any
+>x = ( y = z ==== 'function' : "function"
+>x : any
+>( y = z ==== 'function' : "function"
+>( y = z === : boolean
+>y = z === : boolean
+>y : any
+>z === : boolean
+>z : any
+> : any
+>'function' : "function"
+

tests/cases/compiler/parserUnparsedTokenCrash1.ts

@@ -0,0 +1,4 @@
+// @allowJs: true
+// @outDir: ./out
+// @filename: a.js
+( y = 1 ; 2 )

tests/cases/compiler/parserUnparsedTokenCrash2.ts

@@ -0,0 +1 @@
+export = } x = ( y = z ==== 'function') {