Numbered parameters are valid for pattern matching pinning #1060
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The following is how different versions behave:
```
# Valid only in 2.7
case 0; in _1; end
1.then { 1 in _1 }
# Valid in no versions
case 0; in ^_1; end
# Valid an all versions
1.then { 1 in ^_1 }
```
`@builder.accessible` makes the numparam visible to the environment,
so it must be called first
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The following is how different versions behave:
@builder.accessiblemakes the numparam visible to the environment, so it must be called first