Fix crash in CFA when for loop initializer throws by Andarist · Pull Request #63108 · microsoft/TypeScript

Andarist · 2026-02-05T20:11:38Z

DanielRosenwasser · 2026-02-06T06:31:51Z

@tyepscript-bot test it

DanielRosenwasser · 2026-02-06T06:34:29Z

lmao what https://github.com/microsoft/TypeScript/wiki/Triggering-TypeScript-Bot/a9168073a450877883d68704dc746cfaf4094559

DanielRosenwasser · 2026-02-06T06:34:38Z

@typescript-bot test it

typescript-bot · 2026-02-06T06:34:44Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`test top400`	✅ Started
`user test this`	✅ Started	✅ Results
`run dt`	✅ Started	✅ Results
`perf test this faster`	✅ Started	👀 Results

typescript-bot · 2026-02-06T06:57:00Z

Hey @DanielRosenwasser, the results of running the DT tests are ready.

Everything looks the same!

You can check the log here.

typescript-bot · 2026-02-06T07:04:34Z

@DanielRosenwasser Here are the results of running the user tests with tsc comparing main and refs/pull/63108/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Git clone failed"

Otherwise...

Everything looks good!

typescript-bot · 2026-02-06T07:32:40Z

@DanielRosenwasser
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - node (v18.15.0, x64)}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_82,521	_82,521	_~	_~	_~	_{p=1.000 n=6}
_Types	_125,280	_125,280	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{276,733k (± 0.67%)}	_{274,511k (± 0.06%)}	_~	_274,319k	_274,699k	_{p=0.230 n=6}
_{Parse Time}	_{1.31s (± 0.79%)}	_{1.31s (± 0.31%)}	_~	_1.30s	_1.31s	_{p=0.924 n=6}
_{Bind Time}	_0.75s	_{0.75s (± 0.54%)}	_~	_0.75s	_0.76s	_{p=0.405 n=6}
_{Check Time}	_{14.09s (± 0.35%)}	_{14.08s (± 0.21%)}	_~	_14.04s	_14.11s	_{p=0.746 n=6}
_{Emit Time}	_{2.64s (± 0.50%)}	_{2.64s (± 0.50%)}	_~	_2.62s	_2.66s	_{p=0.607 n=6}
_{Total Time}	_{18.79s (± 0.30%)}	_{18.78s (± 0.09%)}	_~	_18.76s	_18.80s	_{p=0.936 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_955,823	_955,823	_~	_~	_~	_{p=1.000 n=6}
_Types	_415,853	_415,853	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,254,966k (± 0.01%)}	_{1,254,922k (± 0.01%)}	_~	_1,254,839k	_1,255,034k	_{p=0.810 n=6}
_{Parse Time}	_{7.94s (± 0.87%)}	_{8.03s (± 0.33%)}	_~	_7.98s	_8.05s	_{p=0.052 n=6}
_{Bind Time}	_{2.38s (± 0.93%)}	_{2.41s (± 0.97%)}	_~	_2.37s	_2.44s	_{p=0.104 n=6}
_{Check Time}	_{38.78s (± 0.30%)}	_{38.91s (± 0.44%)}	_~	_38.62s	_39.12s	_{p=0.128 n=6}
_{Emit Time}	_{17.92s (± 0.50%)}	_{17.88s (± 0.65%)}	_~	_17.78s	_18.10s	_{p=0.378 n=6}
_{Total Time}	_{67.02s (± 0.30%)}	_{67.23s (± 0.21%)}	_~	_67.07s	_67.48s	_{p=0.128 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	_11,439	_11,439	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,703,113	_2,703,113	_~	_~	_~	_{p=1.000 n=6}
_Types	_931,060	_931,060	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,039,102k (± 0.00%)}	_{3,039,096k (± 0.00%)}	_~	_3,038,963k	_3,039,315k	_{p=0.936 n=6}
_{Parse Time}	_{8.52s (± 0.30%)}	_{8.52s (± 0.13%)}	_~	_8.51s	_8.53s	_{p=1.000 n=6}
_{Bind Time}	_{2.31s (± 0.27%)}	_{2.31s (± 0.39%)}	_~	_2.30s	_2.32s	_{p=1.000 n=6}
_{Check Time}	_{92.86s (± 0.52%)}	_{92.83s (± 0.15%)}	_~	_92.65s	_92.97s	_{p=0.810 n=6}
_{Emit Time}	_{0.32s (± 1.74%)}	_{0.32s (± 1.74%)}	_~	_0.31s	_0.32s	_{p=1.000 n=6}
_{Total Time}	_{104.00s (± 0.48%)}	_{103.97s (± 0.13%)}	_~	_103.78s	_104.13s	_{p=0.810 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,789	_1,252,789	_~	_~	_~	_{p=1.000 n=6}
_Types	_259,991	_259,991	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,394,074k (± 0.02%)}	_{2,454,922k (± 6.06%)}	_~	_2,393,635k	_2,758,901k	_{p=0.471 n=6}
_{Parse Time}	_{5.17s (± 1.17%)}	_{5.12s (± 0.97%)}	_~	_5.07s	_5.21s	_{p=0.149 n=6}
_{Bind Time}	_{1.84s (± 1.22%)}	_{1.83s (± 1.32%)}	_~	_1.81s	_1.87s	_{p=0.743 n=6}
_{Check Time}	_{35.54s (± 0.26%)}	_{35.54s (± 0.64%)}	_~	_35.15s	_35.80s	_{p=0.810 n=6}
_{Emit Time}	_{3.01s (± 0.58%)}	_{3.02s (± 1.08%)}	_~	_2.97s	_3.06s	_{p=0.520 n=6}
_{Total Time}	_{45.60s (± 0.28%)}	_{45.55s (± 0.40%)}	_~	_45.26s	_45.75s	_{p=0.748 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,789	_1,252,789	_~	_~	_~	_{p=1.000 n=6}
_Types	_259,991	_259,991	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,190,283k (± 0.02%)}	_{2,948,170k (±12.69%)}	_~	_2,464,339k	_3,190,639k	_{p=0.173 n=6}
_{Parse Time}	_{6.79s (± 1.29%)}	_{6.80s (± 1.54%)}	_~	_6.65s	_6.92s	_{p=0.810 n=6}
_{Bind Time}	_{2.24s (± 1.25%)}	_{2.26s (± 1.44%)}	_~	_2.22s	_2.31s	_{p=0.296 n=6}
_{Check Time}	_{43.05s (± 0.32%)}	_{43.07s (± 0.48%)}	_~	_42.75s	_43.32s	_{p=0.810 n=6}
_{Emit Time}	_{3.44s (± 1.73%)}	_{3.47s (± 2.16%)}	_~	_3.39s	_3.57s	_{p=0.336 n=6}
_{Total Time}	_{55.53s (± 0.30%)}	_{55.62s (± 0.54%)}	_~	_55.20s	_55.87s	_{p=0.378 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_264,703	_264,703	_~	_~	_~	_{p=1.000 n=6}
_Types	_104,091	_104,091	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{443,675k (± 0.01%)}	_{443,663k (± 0.01%)}	_~	_443,609k	_443,725k	_{p=0.810 n=6}
_{Parse Time}	_{4.33s (± 0.52%)}	_{4.34s (± 0.62%)}	_~	_4.30s	_4.37s	_{p=0.370 n=6}
_{Bind Time}	_{1.71s (± 0.81%)}	_{1.68s (± 1.27%)}	_{-0.03s (- 1.56%)}	_1.64s	_1.70s	_{p=0.029 n=6}
_{Check Time}	_{23.77s (± 0.31%)}	_{23.76s (± 0.29%)}	_~	_23.67s	_23.86s	_{p=0.810 n=6}
_{Emit Time}	_{1.93s (± 1.38%)}	_{1.92s (± 0.85%)}	_~	_1.90s	_1.95s	_{p=0.935 n=6}
_{Total Time}	_{31.73s (± 0.26%)}	_{31.71s (± 0.30%)}	_~	_31.56s	_31.81s	_{p=0.936 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₂₇₁	₂₇₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,118	_225,118	_~	_~	_~	_{p=1.000 n=6}
_Types	_93,554	_93,554	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{370,533k (± 0.02%)}	_{370,559k (± 0.01%)}	_~	_370,503k	_370,638k	_{p=0.575 n=6}
_{Parse Time}	_{2.83s (± 1.16%)}	_{2.82s (± 0.81%)}	_~	_2.79s	_2.84s	_{p=0.569 n=6}
_{Bind Time}	_{1.63s (± 0.78%)}	_{1.65s (± 2.09%)}	_~	_1.60s	_1.70s	_{p=0.280 n=6}
_{Check Time}	_{17.38s (± 0.35%)}	_{17.40s (± 0.25%)}	_~	_17.34s	_17.46s	_{p=0.574 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{21.84s (± 0.39%)}	_{21.87s (± 0.18%)}	_~	_21.83s	_21.93s	_{p=0.688 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_4,221,104	_4,221,104	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,340,209	_1,340,209	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{4,015,297k (± 0.00%)}	_{4,015,300k (± 0.00%)}	_~	_4,015,142k	_4,015,488k	_{p=0.810 n=6}
_{Parse Time}	_{16.21s (± 0.32%)}	_{16.52s (± 3.25%)}	_{+0.32s (+ 1.94%)}	_16.20s	_17.61s	_{p=0.045 n=6}
_{Bind Time}	_{5.49s (± 0.71%)}	_{5.50s (± 0.46%)}	_~	_5.48s	_5.55s	_{p=0.520 n=6}
_{Check Time}	_{121.88s (± 4.41%)}	_{119.26s (± 2.22%)}	_~	_115.93s	_123.50s	_{p=0.378 n=6}
_{Emit Time}	_{53.25s (±15.86%)}	_{55.24s (±13.02%)}	_~	_45.57s	_62.96s	_{p=0.810 n=6}
_{Total Time}	_{196.83s (± 4.53%)}	_{196.53s (± 2.98%)}	_~	_190.45s	_204.25s	_{p=0.810 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_402,249	_402,249	_~	_~	_~	_{p=1.000 n=6}
_Types	_178,120	_178,120	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{559,133k (± 0.02%)}	_{559,017k (± 0.01%)}	_{-115k (- 0.02%)}	_558,905k	_559,107k	_{p=0.031 n=6}
_{Parse Time}	_{4.76s (± 0.55%)}	_{4.76s (± 0.76%)}	_~	_4.71s	_4.82s	_{p=0.570 n=6}
_{Bind Time}	_{2.04s (± 1.34%)}	_{2.03s (± 2.17%)}	_~	_1.99s	_2.11s	_{p=0.746 n=6}
_{Check Time}	_{24.31s (± 1.41%)}	_{24.38s (± 0.39%)}	_~	_24.20s	_24.46s	_{p=0.689 n=6}
_{Emit Time}	_{0.00s (±154.76%)}	_{0.01s (±109.43%)}	_~	_0.00s	_0.01s	_{p=0.640 n=6}
_{Total Time}	_{31.11s (± 1.10%)}	_{31.18s (± 0.40%)}	_~	_30.95s	_31.30s	_{p=1.000 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_731,941	_731,941	_~	_~	_~	_{p=1.000 n=6}
_Types	_219,279	_219,279	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{635,987k (± 0.01%)}	_{635,897k (± 0.01%)}	_{-90k (- 0.01%)}	_635,829k	_635,937k	_{p=0.020 n=6}
_{Parse Time}	_{4.59s (± 0.51%)}	_{4.59s (± 0.80%)}	_~	_4.55s	_4.65s	_{p=0.869 n=6}
_{Bind Time}	_{1.50s (± 0.42%)}	_{1.50s (± 1.17%)}	_~	_1.47s	_1.51s	_{p=0.866 n=6}
_{Check Time}	_{22.17s (± 0.31%)}	_{22.18s (± 0.52%)}	_~	_22.04s	_22.33s	_{p=0.748 n=6}
_{Emit Time}	_{0.00s (±244.70%)}	_0.00s	_~	_~	_~	_{p=0.405 n=6}
_{Total Time}	_{28.26s (± 0.23%)}	_{28.27s (± 0.36%)}	_~	_28.11s	_28.36s	_{p=0.688 n=6}

System info unknown

Hosts

node (v18.15.0, x64)

Scenarios

Compiler-Unions - node (v18.15.0, x64)
angular-1 - node (v18.15.0, x64)
mui-docs - node (v18.15.0, x64)
self-build-src - node (v18.15.0, x64)
self-build-src-public-api - node (v18.15.0, x64)
self-compiler - node (v18.15.0, x64)
ts-pre-modules - node (v18.15.0, x64)
vscode - node (v18.15.0, x64)
webpack - node (v18.15.0, x64)
xstate-main - node (v18.15.0, x64)

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

Developer Information:

Download Benchmarks

Andarist added 6 commits February 5, 2026 14:39

add tests

629847d

add reentry mitigation

f0aeeeb

update tests

aa5b116

target fix in the binder

1ed6890

improve comment

805972d

add test

76f2f2f

github-project-automation bot added this to PR Backlog Feb 5, 2026

github-project-automation bot moved this to Not started in PR Backlog Feb 5, 2026

typescript-bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Feb 5, 2026

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Fix crash in CFA when for loop initializer throws#63108

Fix crash in CFA when for loop initializer throws#63108
Andarist wants to merge 6 commits intomicrosoft:mainfrom
Andarist:fix/crash-cfa-throw-for-head

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