hexresearch / hexresearch/sql-simple-generic

Replace Proxy with "Col"

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good first issue
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Haskell
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Description

Если заменить в ```HasColumn t (Proxy a)``` ```Proxy``` на какой-нибудь Col/Column/ColDef, то можем получить довольно осмысленные сообщения об ошибках:

```
Main.hs:714:11-20: error:
• No instance for (HasColumn "vtask_1" (Proxy InvoiceName))
```

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