Fix panic when parsing labels:[]

[prymitive]

No description provided.

[github-actions]

This pull request was validated by pint.

✔️ No problems found

Stats

Stat	Value
Version	v0.77.0-3-g9cbd2775
Number of rules parsed	9
Number of rules checked	9
Number of problems found	0
Number of offline checks	0
Number of online checks	0
Checks duration	0

Problems

No problems reported

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.07%. Comparing base (1cce7a2) to head (9cbd277).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1616      +/-   ##
==========================================
- Coverage   97.07%   97.07%   -0.01%     
==========================================
  Files         109      109              
  Lines       13233    13230       -3     
==========================================
- Hits        12846    12843       -3     
  Misses        255      255              
  Partials      132      132              

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[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              │
GlobFinder-4          29.52m ± ∞ ¹   30.78m ± ∞ ¹       ~ (p=0.222 n=5)
GitFinder-4           391.4m ± ∞ ¹   391.9m ± ∞ ¹       ~ (p=0.548 n=5)
CheckRules-4           9.461 ± ∞ ¹    9.500 ± ∞ ¹       ~ (p=0.421 n=5)
RuleIsIdentical-4     5.822m ± ∞ ¹   5.853m ± ∞ ¹       ~ (p=0.056 n=5)
GetChecksForEntry-4   111.8m ± ∞ ¹   112.5m ± ∞ ¹       ~ (p=0.151 n=5)
geomean               148.1m         149.8m        +1.19%
¹ need >= 6 samples for confidence interval at level 0.95

                    │    old.txt     │                new.txt                 │
                    │      B/op      │      B/op       vs base                │
GlobFinder-4           9.329Mi ± ∞ ¹    9.331Mi ± ∞ ¹  +0.02% (p=0.032 n=5)
GitFinder-4            19.10Mi ± ∞ ¹    19.09Mi ± ∞ ¹       ~ (p=0.690 n=5)
CheckRules-4          1021.3Mi ± ∞ ¹   1019.5Mi ± ∞ ¹       ~ (p=0.222 n=5)
RuleIsIdentical-4        0.000 ± ∞ ¹      0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
GetChecksForEntry-4    56.55Mi ± ∞ ¹    56.55Mi ± ∞ ¹       ~ (p=0.222 n=5)
geomean                            ³                   -0.04%               ³
¹ need >= 6 samples for confidence interval at level 0.95
² all samples are equal
³ summaries must be >0 to compute geomean

                    │   old.txt    │               new.txt                │
                    │  allocs/op   │  allocs/op    vs base                │
GlobFinder-4          140.4k ± ∞ ¹   140.4k ± ∞ ¹  +0.00% (p=0.040 n=5)
GitFinder-4           179.9k ± ∞ ¹   179.9k ± ∞ ¹       ~ (p=0.881 n=5)
CheckRules-4          14.99M ± ∞ ¹   14.98M ± ∞ ¹  -0.05% (p=0.008 n=5)
RuleIsIdentical-4      0.000 ± ∞ ¹    0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
GetChecksForEntry-4   915.8k ± ∞ ¹   915.8k ± ∞ ¹       ~ (p=0.270 n=5)
geomean                          ³                 -0.01%               ³
¹ need >= 6 samples for confidence interval at level 0.95
² all samples are equal
³ summaries must be >0 to compute geomean

pkg: github.com/cloudflare/pint/internal/parser
        │   old.txt    │            new.txt            │
        │    sec/op    │    sec/op     vs base         │
Parse-4   27.71m ± ∞ ¹   27.25m ± ∞ ¹  ~ (p=0.222 n=5)
¹ need >= 6 samples for confidence interval at level 0.95

        │    old.txt    │            new.txt             │
        │     B/op      │     B/op       vs base         │
Parse-4   8.379Mi ± ∞ ¹   8.379Mi ± ∞ ¹  ~ (p=1.000 n=5)
¹ need >= 6 samples for confidence interval at level 0.95

        │   old.txt    │            new.txt            │
        │  allocs/op   │  allocs/op    vs base         │
Parse-4   139.4k ± ∞ ¹   139.4k ± ∞ ¹  ~ (p=0.619 n=5)
¹ need >= 6 samples for confidence interval at level 0.95

pkg: github.com/cloudflare/pint/internal/parser/utils
               │   old.txt    │            new.txt            │
               │    sec/op    │    sec/op     vs base         │
LabelsSource-4   5.076m ± ∞ ¹   5.015m ± ∞ ¹  ~ (p=0.421 n=5)
¹ need >= 6 samples for confidence interval at level 0.95

               │    old.txt    │            new.txt             │
               │     B/op      │     B/op       vs base         │
LabelsSource-4   4.085Mi ± ∞ ¹   4.081Mi ± ∞ ¹  ~ (p=0.690 n=5)
¹ need >= 6 samples for confidence interval at level 0.95

               │   old.txt    │            new.txt            │
               │  allocs/op   │  allocs/op    vs base         │
LabelsSource-4   33.54k ± ∞ ¹   33.54k ± ∞ ¹  ~ (p=0.810 n=5)
¹ need >= 6 samples for confidence interval at level 0.95

pkg: github.com/cloudflare/pint/internal/promapi
                    │   old.txt    │              new.txt               │
                    │    sec/op    │    sec/op     vs base              │
QueryCacheOnlySet-4   102.3n ± ∞ ¹   103.0n ± ∞ ¹       ~ (p=0.127 n=5)
QueryCacheSetGrow-4   392.2n ± ∞ ¹   360.8n ± ∞ ¹       ~ (p=0.841 n=5)
QueryCacheGetMiss-4   16.36n ± ∞ ¹   16.42n ± ∞ ¹       ~ (p=0.587 n=5)
QueryCacheGC/0%-4     33.70µ ± ∞ ¹   33.49µ ± ∞ ¹       ~ (p=0.841 n=5)
QueryCacheGC/1%-4     35.29µ ± ∞ ¹   34.39µ ± ∞ ¹       ~ (p=0.548 n=5)
QueryCacheGC/10%-4    38.56µ ± ∞ ¹   37.96µ ± ∞ ¹       ~ (p=0.548 n=5)
QueryCacheGC/20%-4    67.92µ ± ∞ ¹   67.30µ ± ∞ ¹  -0.92% (p=0.008 n=5)
QueryCacheGC/25%-4    67.65µ ± ∞ ¹   66.82µ ± ∞ ¹  -1.24% (p=0.016 n=5)
QueryCacheGC/50%-4    65.11µ ± ∞ ¹   65.41µ ± ∞ ¹       ~ (p=0.310 n=5)
QueryCacheGC/75%-4    49.72µ ± ∞ ¹   49.27µ ± ∞ ¹       ~ (p=0.151 n=5)
QueryCacheGC/99%-4    49.56µ ± ∞ ¹   49.40µ ± ∞ ¹       ~ (p=0.548 n=5)
QueryCacheGC/100%-4   50.23µ ± ∞ ¹   49.84µ ± ∞ ¹       ~ (p=0.095 n=5)
geomean               10.09µ         9.959µ        -1.31%
¹ need >= 6 samples for confidence interval at level 0.95

                    │    old.txt    │                new.txt                │
                    │     B/op      │     B/op       vs base                │
QueryCacheOnlySet-4     64.00 ± ∞ ¹     64.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheSetGrow-4     123.0 ± ∞ ¹     112.0 ± ∞ ¹       ~ (p=0.984 n=5)
QueryCacheGetMiss-4     0.000 ± ∞ ¹     0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/0%-4       0.000 ± ∞ ¹     0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/1%-4       0.000 ± ∞ ¹     0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/10%-4      0.000 ± ∞ ¹     0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/20%-4    18.09Ki ± ∞ ¹   18.09Ki ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/25%-4    18.09Ki ± ∞ ¹   18.09Ki ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/50%-4    18.09Ki ± ∞ ¹   18.09Ki ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/75%-4      48.00 ± ∞ ¹     48.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/99%-4      48.00 ± ∞ ¹     48.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/100%-4     48.00 ± ∞ ¹     48.00 ± ∞ ¹       ~ (p=1.000 n=5) ²
geomean                           ³                  -0.78%               ³
¹ need >= 6 samples for confidence interval at level 0.95
² all samples are equal
³ summaries must be >0 to compute geomean

                    │   old.txt   │               new.txt               │
                    │  allocs/op  │  allocs/op   vs base                │
QueryCacheOnlySet-4   1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheSetGrow-4   1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGetMiss-4   0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/0%-4     0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/1%-4     0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/10%-4    0.000 ± ∞ ¹   0.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/20%-4    4.000 ± ∞ ¹   4.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/25%-4    4.000 ± ∞ ¹   4.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/50%-4    4.000 ± ∞ ¹   4.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/75%-4    1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/99%-4    1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
QueryCacheGC/100%-4   1.000 ± ∞ ¹   1.000 ± ∞ ¹       ~ (p=1.000 n=5) ²
geomean                         ³                +0.00%               ³
¹ need >= 6 samples for confidence interval at level 0.95
² all samples are equal
³ summaries must be >0 to compute geomean