Remove warnings Infer.scala

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6565b3a) 92.02% compared to head (1a9aa68) 92.09%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1059 +/- ## ========================================== + Coverage 92.02% 92.09% +0.07% ========================================== Files 93 93 Lines 9883 9883 Branches 2311 2311 ========================================== + Hits 9095 9102 +7 + Misses 788 781 -7 ``` | [Files](https://app.codecov.io/gh/johnynek/bosatsu/pull/1059?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=P.+Oscar+Boykin) | Coverage Δ | | |---|---|---| | [.../src/main/scala/org/bykn/bosatsu/rankn/Infer.scala](https://app.codecov.io/gh/johnynek/bosatsu/pull/1059?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=P.+Oscar+Boykin#diff-Y29yZS9zcmMvbWFpbi9zY2FsYS9vcmcvYnlrbi9ib3NhdHN1L3JhbmtuL0luZmVyLnNjYWxh) | `96.25% <75.00%> (ø)` | | ... and [6 files with indirect coverage changes](https://app.codecov.io/gh/johnynek/bosatsu/pull/1059/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=P.+Oscar+Boykin)

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