Auto merge of #209 - Dylnuge:slice-assert, r=komaeda

fix(primitive_types4): Fail on a slice covering the wrong area

I noticed this issue and it seems like a similar one was raised/fixed in #160 this way. This is my first contribution to this repo (or any Rust project) so let me know if I messed up or need to fix anything!

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This commit converts primitive_types4 to a test and asserts that the
slice given is equal to the expected slice.

The intent of the primitive_types4 exercise appears to be to ensure the
user understands inclusive and exclusive bounds as well as slice syntax.
`rustlings` commands using `compile` do not verify that a specific
println is reached and, in the case of `watch` and `verify` (but not
`run`), they do not output the `println`s at all.

This fix is semantically similar to #198. It does not take a stance on
the correct way to handle this for all exercises; see #127. There are
likely other exercises whose intent are masked by this issue.

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