Fix a crash in vector() parsing

[prymitive]

No description provided.

[github-actions]

This pull request was validated by pint.

✔️ No problems found

Stats

Stat	Value
Version	v0.67.2-1-gf481b96
Number of rules parsed	4
Number of rules checked	4
Number of problems found	0
Number of offline checks	0
Number of online checks	0
Checks duration	0

Problems

No problems reported

[github-actions]

Benchmark diff:

goos: linux
goarch: amd64
pkg: github.com/cloudflare/pint/cmd/pint
cpu: AMD EPYC 7763 64-Core Processor                
              │   old.txt   │              new.txt               │
              │   sec/op    │   sec/op     vs base               │
FindEntries-4   39.89m ± 1%   39.82m ± 4%       ~ (p=0.971 n=10)
CheckRules-4     8.498 ± 2%    8.502 ± 2%       ~ (p=0.853 n=10)
geomean         582.2m        581.8m       -0.07%

              │   old.txt    │               new.txt               │
              │     B/op     │     B/op      vs base               │
FindEntries-4   27.41Mi ± 0%   27.41Mi ± 0%       ~ (p=0.353 n=10)
CheckRules-4    975.1Mi ± 0%   975.2Mi ± 0%       ~ (p=0.684 n=10)
geomean         163.5Mi        163.5Mi       +0.01%

              │   old.txt   │              new.txt               │
              │  allocs/op  │  allocs/op   vs base               │
FindEntries-4   131.9k ± 0%   131.9k ± 0%       ~ (p=0.318 n=10)
CheckRules-4    14.15M ± 0%   14.15M ± 0%       ~ (p=0.631 n=10)
geomean         1.366M        1.366M       +0.00%

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.99%. Comparing base (e9cce03) to head (f481b96).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1183   +/-   ##
=======================================
  Coverage   94.99%   94.99%           
=======================================
  Files         104      104           
  Lines       12559    12561    +2     
=======================================
+ Hits        11930    11932    +2     
  Misses        480      480           
  Partials      149      149           

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