fix each block sourcemap hack

src/compiler/compile/render_dom/wrappers/EachBlock.ts

@@ -107,14 +107,14 @@ export default class EachBlockWrapper extends Wrapper {
 		// is easy to find
 		let c = this.node.start + 2;
 		while (renderer.component.source[c] !== 'e') c += 1;
+		const start = renderer.component.locate(c);
+		start.line += 1;
+		const end = { line: start.line, column: start.column + 4 };
 		const length = {
 			type: 'Identifier',
 			name: 'length',
-			// TODO this format may be incorrect
+			loc: { start, end }
-			start: c,
-			end: c + 4
 		};
-		// renderer.component.code.overwrite(c, c + 4, 'length');
 
 		const each_block_value = renderer.component.get_unique_name(`${this.var.name}_value`);
 		const iterations = block.get_unique_name(`${this.var.name}_blocks`);

test/sourcemaps/samples/each-block/test.js

@@ -1,15 +1,15 @@
-export function test({ assert, code, smc, locateInSource, locateInGenerated }) {
+export function test({ assert, code, smc, map, locateInSource, locateInGenerated }) {
 	const startIndex = code.indexOf('create_main_fragment');
 
 	const expected = locateInSource('each');
-	const start = locateInGenerated('length', startIndex );
+	const start = locateInGenerated('length', startIndex);
 
 	const actual = smc.originalPositionFor({
 		line: start.line + 1,
 		column: start.column
 	});
 
-	assert.deepEqual( actual, {
+	assert.deepEqual(actual, {
 		source: 'input.svelte',
 		name: null,
 		line: expected.line + 1,