Expect the map and record-width results the PR's lowering now gives

packages/compiler/test/map-closure-elements.test.ts

@@ -58,7 +58,7 @@ export {};
   expect(validateModule(result.module)).toEqual([]);
 });
 
-test("a void-returning map callback still has no element to store", async () => {
+test("a void-returning map callback stores undefined elements", async () => {
   const result = await lower(`
 const items = [1, 2];
 const out = items.map((n) => {
@@ -67,8 +67,8 @@ const out = items.map((n) => {
 console.log(out.length);
 export {};
 `);
-  // `void[]` stays unrepresentable: a void value is erased before it could
-  // be written. Only the CLOSURE element became an ordinary element.
-  expect(result.ok).toBe(false);
-  if (!result.ok) expect(result.codes).toEqual(["SC2009"]);
+  // A discarding mapper's answer is undefined, which the result array
+  // stores as its element (as Node's map does).
+  if (!result.ok) throw new Error(`fenced: ${result.codes.join(", ")}`);
+  expect(validateModule(result.module)).toEqual([]);
 });

tests/harness/__snapshots__/record-width.ts.txt

@@ -7,15 +7,6 @@ record-width.ts:12:25 - error SC2002: record shapes must match exactly or width-
 
   hint: width subtyping compiles as a copy (each expected field copied off the source; extra fields drop) — this pair is outside the copy's rules; build a literal with exactly the expected fields instead
 
-record-width.ts:26:20 - error SC2002: record shapes must match exactly or width-coerce: expected '{ m: ({ a: number; b: number }) => void }', got '{ extra: number; m: ({ a: number }) => void }' — field 'm': '({ a: number }) => void' does not lift into '({ a: number; b: number }) => void'
-
-  25 | };
-  26 | const dstM: DstM = srcM;
-     |                    ^~~~
-  27 | console.log(dstM);
-
-  hint: width subtyping compiles as a copy (each expected field copied off the source; extra fields drop) — this pair is outside the copy's rules; build a literal with exactly the expected fields instead
-
 record-width.ts:27:13 - error SC1090: console.log of '{ m: ({ a: number; b: number }) => void }' values (function values have no inspect lowering (no runtime name exists — Node prints '[Function: name]'; pass the function's declared identifier directly to util.inspect for the baked form)) is not supported yet
 
   26 | const dstM: DstM = srcM;