Merge pull request #4085 from Conduitry/gh-4077

fix bitmask overflow when using slotted components

Author: Rich-Harris

src/compiler/compile/render_dom/Renderer.ts

@@ -86,8 +86,6 @@ export default class Renderer {
 			null
 		);
 
-		this.context_overflow = this.context.length > 31;
-
 		// TODO messy
 		this.blocks.forEach(block => {
 			if (block instanceof Block) {
@@ -99,6 +97,8 @@ export default class Renderer {
 
 		this.fragment.render(this.block, null, x`#nodes` as Identifier);
 
+		this.context_overflow = this.context.length > 31;
+
 		this.context.forEach(member => {
 			const { variable } = member;
 			if (variable) {

test/runtime/samples/bitmask-overflow-3/_config.js

@@ -0,0 +1,3 @@
+export default {
+	error: `A is not defined`,
+};

test/runtime/samples/bitmask-overflow-3/main.svelte

@@ -0,0 +1,4 @@
+<script>
+	let x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, x29, x30, x31;
+</script>
+<A>foo</A>