sometimes doesnt throw errors because files are checked only if loaded from entrypoint

[srghma]

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this is not exactly a bug, but

IF I run spago build --watch in some termial - it will show all errors, doesnt matter if module is used or not

BUT with purs-loader

1. clone this repo https://github.com/srghma/purescript-webpack-example/tree/webpack-spago-loader
2. run webpack with watch mode
3. change something in

https://github.com/srghma/purescript-webpack-example/blob/webpack-spago-loader/src/Example/UnusedInUnused.purs

or https://github.com/srghma/purescript-webpack-example/blob/webpack-spago-loader/src/Example/Unused.purs, you can even make it invalid

or add a hole

4. there will be no recompilation and no error

expected: recompilation and error