handle invalid expression inside each expression

packages/svelte/src/compiler/phases/1-parse/state/tag.js

@@ -180,7 +180,20 @@ function open(parser) {
 			parser.allow_whitespace();
 		}
 
-		parser.eat('}', true);
+		const matches = parser.eat('}', true, false);
+
+		// Parser may have read the `as` as part of the expression (e.g. in `{#each foo. as x}`)
+		if (!matches && parser.template.slice(parser.index - 4, parser.index) === ' as ') {
+			const prev_index = parser.index;
+			context = read_pattern(parser);
+			parser.eat('}', true);
+			expression = {
+				type: 'Identifier',
+				name: '',
+				start: expression.start,
+				end: prev_index - 4
+			};
+		}
 
 		/** @type {AST.EachBlock} */
 		const block = parser.append({

packages/svelte/tests/parser-legacy/samples/loose-invalid-expression/input.svelte

@@ -13,3 +13,5 @@ asd{a.}asd
 {#if x.}{/if}
 
 {#each array as item (item.)}{/each}
+
+{#each obj. as item}{/each}

packages/svelte/tests/parser-legacy/samples/loose-invalid-expression/output.json

@@ -2,7 +2,7 @@
 	"html": {
 		"type": "Fragment",
 		"start": 0,
-		"end": 217,
+		"end": 246,
 		"children": [
 			{
 				"type": "Element",
@@ -308,6 +308,43 @@
 					"end": 208,
 					"name": ""
 				}
+			},
+			{
+				"type": "Text",
+				"start": 217,
+				"end": 219,
+				"raw": "\n\n",
+				"data": "\n\n"
+			},
+			{
+				"type": "EachBlock",
+				"start": 219,
+				"end": 246,
+				"children": [],
+				"context": {
+					"type": "Identifier",
+					"name": "item",
+					"start": 234,
+					"loc": {
+						"start": {
+							"line": 17,
+							"column": 15,
+							"character": 234
+						},
+						"end": {
+							"line": 17,
+							"column": 19,
+							"character": 238
+						}
+					},
+					"end": 238
+				},
+				"expression": {
+					"type": "Identifier",
+					"name": "",
+					"start": 226,
+					"end": 230
+				}
 			}
 		]
 	}

packages/svelte/tests/parser-modern/samples/loose-invalid-expression/input.svelte

@@ -13,3 +13,5 @@ asd{a.}asd
 {#if x.}{/if}
 
 {#each array as item (item.)}{/each}
+
+{#each obj. as item}{/each}

packages/svelte/tests/parser-modern/samples/loose-invalid-expression/output.json

@@ -2,7 +2,7 @@
 	"css": null,
 	"js": [],
 	"start": 0,
-	"end": 217,
+	"end": 246,
 	"type": "Root",
 	"fragment": {
 		"type": "Fragment",
@@ -327,6 +327,46 @@
 					"end": 208,
 					"name": ""
 				}
+			},
+			{
+				"type": "Text",
+				"start": 217,
+				"end": 219,
+				"raw": "\n\n",
+				"data": "\n\n"
+			},
+			{
+				"type": "EachBlock",
+				"start": 219,
+				"end": 246,
+				"expression": {
+					"type": "Identifier",
+					"name": "",
+					"start": 226,
+					"end": 230
+				},
+				"body": {
+					"type": "Fragment",
+					"nodes": []
+				},
+				"context": {
+					"type": "Identifier",
+					"name": "item",
+					"start": 234,
+					"loc": {
+						"start": {
+							"line": 17,
+							"column": 15,
+							"character": 234
+						},
+						"end": {
+							"line": 17,
+							"column": 19,
+							"character": 238
+						}
+					},
+					"end": 238
+				}
 			}
 		]
 	},