Turbopack: Update rust toolchain to nightly-2026-02-18

[bgw]

Rust finally merged a fix to the "trying to encode a dep node twice" ICE we seem to most frequently run into, triggered by the rustc parallel frontend feature: rust-lang/rust#151509

• @mischnic commented on the issue: assertion failed: trying to encode a dep node twice rust-lang/rust#150018 (comment)
• @mischnic just updated our toolchain last week, but I'd like to get this fix in.

CI Job for build-and-release that covers all platforms: https://github.com/vercel/next.js/actions/runs/22156881743

In the process of this upgrade, I found and reported rust-lang/rust#152735 upstream (fixed nightly-2026-02-18).

[bgw]

• Turbopack: Update rust toolchain to nightly-2026-02-18 #89974 👈 (View in Graphite)
• Turbopack: Fix flake in task_statistics unit test #89981
• canary

This stack of pull requests is managed by Graphite. Learn more about stacking.

[vercel]

Additional Suggestion:

Devcontainer feature file references old Rust nightly version (nightly-2026-02-05) while rust-toolchain.toml was updated to nightly-2026-02-13.

[nextjs-bot]

Stats from current PR

✅ No significant changes detected

📊 All Metrics

📖 Metrics Glossary

Dev Server Metrics:

• Listen = TCP port starts accepting connections
• First Request = HTTP server returns successful response
• Cold = Fresh build (no cache)
• Warm = With cached build artifacts

Build Metrics:

• Fresh = Clean build (no .next directory)
• Cached = With existing .next directory

Change Thresholds:

• Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
• Size: Changes < 1KB AND < 1% are insignificant
• All other changes are flagged to catch regressions

⚡ Dev Server

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	455ms	✓	▁▁▁▁▁
Cold (Ready in log)	441ms	439ms	✓	▁▁▁▁▁
Cold (First Request)	1.274s	1.247s	✓	▃▁▃▃▃
Warm (Listen)	457ms	457ms	✓	▁▁▁▁▁
Warm (Ready in log)	449ms	443ms	✓	▁▁▁▁▁
Warm (First Request)	355ms	345ms	✓	▁▂▂▂▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	455ms	✓	▁▁▄▁█
Cold (Ready in log)	436ms	435ms	✓	▃▁▄▁█
Cold (First Request)	1.925s	1.933s	✓	▂▁▂▁█
Warm (Listen)	456ms	455ms	✓	▁▁▄▁█
Warm (Ready in log)	436ms	435ms	✓	▃▁▃▁█
Warm (First Request)	1.929s	1.952s	✓	▂▁▂▁█

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.901s	3.894s	✓	▁▁▁▁▁
Cached Build	3.949s	3.887s	✓	▁▁▁▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.864s	13.909s	✓	▁▁▂▁█
Cached Build	13.978s	13.986s	✓	▁▁▂▁█
node_modules Size	472 MB	472 MB	✓	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **398 kB** → **398 kB** ⚠️ +13 B

80 files with content-based hashes (individual files not comparable between builds)

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	761 B	768 B	✓
Total	761 B	768 B	⚠️ +7 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	452 B	451 B	✓
Total	452 B	451 B	✅ -1 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.47 kB	N/A	-
6280-HASH.js gzip	57 kB	N/A	-
6335.HASH.js gzip	169 B	N/A	-
912-HASH.js gzip	4.53 kB	N/A	-
e8aec2e4-HASH.js gzip	62.6 kB	N/A	-
framework-HASH.js gzip	59.7 kB	59.7 kB	✓
main-app-HASH.js gzip	256 B	254 B	✓
main-HASH.js gzip	39.1 kB	39.1 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
262-HASH.js gzip	N/A	4.53 kB	-
2889.HASH.js gzip	N/A	169 B	-
5602-HASH.js gzip	N/A	5.48 kB	-
6948ada0-HASH.js gzip	N/A	62.6 kB	-
9544-HASH.js gzip	N/A	57.8 kB	-
Total	231 kB	231 kB	⚠️ +726 B

Polyfills

	Canary	PR	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Total	39.4 kB	39.4 kB	✓

Pages

	Canary	PR	Change
_app-HASH.js gzip	194 B	194 B	✓
_error-HASH.js gzip	183 B	180 B	🟢 3 B (-2%)
css-HASH.js gzip	331 B	330 B	✓
dynamic-HASH.js gzip	1.81 kB	1.81 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	351 B	352 B	✓
hooks-HASH.js gzip	384 B	383 B	✓
image-HASH.js gzip	580 B	581 B	✓
index-HASH.js gzip	260 B	260 B	✓
link-HASH.js gzip	2.5 kB	2.5 kB	✓
routerDirect..HASH.js gzip	320 B	319 B	✓
script-HASH.js gzip	386 B	386 B	✓
withRouter-HASH.js gzip	315 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.97 kB	✅ -2 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	126 kB	125 kB	✓
page.js gzip	250 kB	251 kB	✓
Total	376 kB	376 kB	⚠️ +336 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	615 B	613 B	✓
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	43.6 kB	43.5 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	45.3 kB	45.1 kB	✅ -159 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	715 B	718 B	✓
Total	715 B	718 B	⚠️ +3 B

Build Cache

	Canary	PR	Change
0.pack gzip	3.91 MB	3.91 MB	🔴 +6.81 kB (+0%)
index.pack gzip	104 kB	104 kB	✓
index.pack.old gzip	104 kB	103 kB	✓
Total	4.11 MB	4.12 MB	⚠️ +5.94 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	316 kB	316 kB	✓
app-page-exp..prod.js gzip	168 kB	168 kB	✓
app-page-tur...dev.js gzip	316 kB	316 kB	✓
app-page-tur..prod.js gzip	168 kB	168 kB	✓
app-page-tur...dev.js gzip	312 kB	312 kB	✓
app-page-tur..prod.js gzip	166 kB	166 kB	✓
app-page.run...dev.js gzip	313 kB	313 kB	✓
app-page.run..prod.js gzip	166 kB	166 kB	✓
app-route-ex...dev.js gzip	70.5 kB	70.5 kB	✓
app-route-ex..prod.js gzip	49.1 kB	49.1 kB	✓
app-route-tu...dev.js gzip	70.6 kB	70.6 kB	✓
app-route-tu..prod.js gzip	49.1 kB	49.1 kB	✓
app-route-tu...dev.js gzip	70.1 kB	70.1 kB	✓
app-route-tu..prod.js gzip	48.9 kB	48.9 kB	✓
app-route.ru...dev.js gzip	70.1 kB	70.1 kB	✓
app-route.ru..prod.js gzip	48.8 kB	48.8 kB	✓
dist_client_...dev.js gzip	324 B	324 B	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
dist_client_...dev.js gzip	317 B	317 B	✓
pages-api-tu...dev.js gzip	43.2 kB	43.2 kB	✓
pages-api-tu..prod.js gzip	32.9 kB	32.9 kB	✓
pages-api.ru...dev.js gzip	43.2 kB	43.2 kB	✓
pages-api.ru..prod.js gzip	32.8 kB	32.8 kB	✓
pages-turbo....dev.js gzip	52.5 kB	52.5 kB	✓
pages-turbo...prod.js gzip	38.4 kB	38.4 kB	✓
pages.runtim...dev.js gzip	52.5 kB	52.5 kB	✓
pages.runtim..prod.js gzip	38.4 kB	38.4 kB	✓
server.runti..prod.js gzip	63.6 kB	63.6 kB	✓
Total	2.8 MB	2.8 MB	✅ -1 B

[codspeed-hq]

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

---

_{Comparing bgw/update-rust-toolchain (bf7a478) with canary (da445e8)}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[nextjs-bot]

Tests Passed

[mischnic]

error: this block may be rewritten with the `?` operator
Error:   --> turbopack/crates/turbopack-ecmascript/src/source_map.rs:59:12
   |
59 |       } else if let Some(data) = url.strip_prefix(DATA_PREAMBLE_CHARSET) {
   |  ____________^
60 | |         data
61 | |     } else {
62 | |         return None;
63 | |     };
   | |_____^ help: replace it with: `{ url.strip_prefix(DATA_PREAMBLE_CHARSET)? }`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#question_mark
   = note: `-D clippy::question-mark` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::question_mark)]`

[bgw]

Merge activity

• Feb 18, 11:41 PM UTC: @bgw merged this pull request with Graphite.