test(link): regression guard for #8907 — full-stdlib links without the http ext archive

[steinybot]

Summary

Adds an end-to-end regression test for #8907: a program that references a cgu.0-only stdlib symbol (new Blob([...])) with no node:http import must link and run. The bug itself was already fixed by #5983 (v0.5.1239) — this fills the missing regression coverage.

Changes

• crates/perry/tests/issue_8907_ext_http_cgu_link.rs: compile const b = new Blob(["x"]); console.log(b.size), assert perry compile links and the binary prints 1.
• changelog.d/9243-ext-http-cgu-link-regression-test.md: changelog fragment.

Root cause (for context): #5831 leaked external-http-client-pump into perry-stdlib's full feature, which declares js_ext_http_* symbols defined only in perry-ext-http. That archive is linked per-program by the compile driver, and only when the program imports node:http. The release packs stdlib into one monolithic cgu.0 object, so referencing any symbol it uniquely defines (Blob → js_blob_new) pulls the whole member and its unresolved http references into the link. #5983 drops the pump from full; the driver activates it only when node:http is imported and perry-ext-http is on the link line.

Complements the manifest-level guard in issue_8587_prebuilt_stdlib_http_isolation (asserts full does not enable the external http pumps) with a real end-to-end link.

Related issue

Refs #8907. Fixed in code by #5983 (v0.5.1239); this PR adds regression coverage.

Test plan

cargo test -p perry --test issue_8907_ext_http_cgu_link
# test cgu0_program_links_without_http_ext_archive ... ok
cargo fmt -p perry -- --check   # clean

Also confirmed against the shipped binaries: released perry 0.5.1220 fails the same repro with 14 undefined js_ext_http_* symbols; current main links and runs it (prints 1). The fix commit was located by git bisect over cgu=1 dist builds → #5983.

• cargo build --release clean
• cargo test --workspace passes (ran the scoped -p perry --test issue_8907_ext_http_cgu_link instead — test-only change)
• Added a #[test] in the affected crate
• (if CLI / stdlib / runtime API changed) Updated docs/src/ — n/a, test-only
• (if touching a platform UI backend) Built -p perry-ui-<backend> — n/a

Screenshots / output

Released 0.5.1220 (the bug):

Undefined symbols for architecture arm64:
  "_js_ext_http_agent_dispatch_method", referenced from:
  ... (14 total)
ld: symbol(s) not found for architecture arm64

Current main (fixed): Wrote executable, runs, prints 1.

Checklist

• I have NOT bumped the workspace version or edited CLAUDE.md / CHANGELOG.md (maintainer handles these at merge)
• My commits follow the feat: / fix: / docs: / chore: prefix convention
• I've read CONTRIBUTING.md and agree to the Code of Conduct

Summary by CodeRabbit

• Tests

  • Added an end-to-end regression test ensuring programs using Blob compile, link, run successfully, and produce the expected output without requiring unrelated HTTP functionality.

• Documentation

  • Added a changelog entry documenting the regression coverage and confirming the issue is resolved.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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• crates/perry/tests/issue_8907_ext_http_cgu_link.rs

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📝 Walkthrough

Walkthrough

The change adds an end-to-end regression test for compiling and running new Blob([...]) without importing node:http. It also documents the root cause and fixing release.

Changes

HTTP CGU link validation

Layer / File(s)	Summary
Blob link regression test crates/perry/tests/issue_8907_ext_http_cgu_link.rs, changelog.d/9243-ext-http-cgu-link-regression-test.md	The test resolves the Perry binary, compiles a Blob program without the HTTP extension archive, runs the output binary, and checks for 1\n. The changelog records the regression and fix.

Estimated code review effort: 3 (Moderate) | ~15–30 minutes

Merge Risk: ⚪ Minimal · up to efa13

This PR adds regression coverage for an existing linker fix without changing production behavior or public interfaces. No actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the link-related regression test for issue #8907 and states the main behavior it guards.
Description check	✅ Passed	The description includes the required Summary, Changes, Related issue, Test plan, Screenshots / output, and Checklist sections. It explains the root cause, test coverage, commands run, and remaining s…

Full details: Description check

Explanation

The description includes the required Summary, Changes, Related issue, Test plan, Screenshots / output, and Checklist sections. It explains the root cause, test coverage, commands run, and remaining scoped test limitations. The unchecked CONTRIBUTING.md and Code of Conduct item is a minor omission.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@CLAUDE.md`:
- Line 11: Restore the release metadata to version 0.5.1519: update CLAUDE.md
line 11 to the corresponding Current Version value and Cargo.toml line 338 to
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📒 Files selected for processing (3)

• CLAUDE.md
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• crates/perry/tests/issue_8907_ext_http_cgu_link.rs

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[proggeramlug]

Merged. Thanks — the root-cause writeup is the valuable part here, and I verified its premise directly rather than taking it on trust.

Confirmed in the built archive: js_blob_new is defined in …perry_stdlib.c4d96a4db3fa0ceb-cgu.0.rcgu.o — exactly the monolithic object your analysis names — and that archive currently carries 0 undefined _js_ext_http_* references. So the coupling is genuinely gone on main, which is why the test passes, and Blob is the right minimal trigger: pulling the member for a cgu.0-only symbol is what would drag the unresolved references back into the link. "The node:http framing is a red herring" is the insight that makes this test possible at all — a test written against the reported symptom would have imported node:http and never reproduced anything.

The test itself is built to be able to fail, which is what I care about in a regression guard:

• --no-cache, so it can't pass on a cached artifact;
• it runs the binary and asserts size == 1 rather than only asserting the compile exited zero — so a compile that succeeded without linking the member coherently is still caught;
• CARGO_BIN_EXE_perry, so it tests the compiler built from the tree rather than whatever is on PATH.

perry --test issue_8907_ext_http_cgu_link: 1 passed, exit 0. ci_e2e_scope.py picks the suite up automatically from the diff (crates/perry/tests/ suites are diff-driven; the manual _CODEGEN_SUITES list is only for perry-codegen), so it will actually run per-PR rather than being dark until nightly — worth saying because a suite that CI never invokes is the exact failure mode #7708 and #9193 were about.

One nit I could not push to your branch, since it's on your fork: cargo fmt --all -- --check wants the std::fs::write(...) call at line 33 wrapped across lines, which fails the warnings/fmt lint gate. I'm landing that as an immediate follow-up on main rather than bouncing the PR back to you for a line break.