env: remove unwrap in examples in favor of try op

[udoprog]

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[rust-highfive]

r? @shepmaster

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[shepmaster]

I think I'm generally in favor of this, but I'm hesitant to accept it as-is because doctests will be getting the ability to use ? as well. Exposing the main here is thus annoying visual churn.

I could see if we used the # to hide the main:

+/// # fn main() -> std::io::Result<()> {
+/// let path = env::current_dir()?;
+/// println!("The current directory is {}", path.display());
+/// # Ok(())
+/// # }

But I wonder if hiding the Ok is too much.

[udoprog]

@shepmaster this is only documentation, we can patch it again when try-op is available for doctests.

This change puts it in line with other similar doctests (e.g. https://doc.rust-lang.org/std/io/trait.Read.html) which will also have to be patched later.

[shepmaster]

Ah, alright then.

@bors r+

[bors]

📌 Commit f73c4a4 has been approved by shepmaster

[shepmaster]

@bors rollup

[shepmaster]

Thanks!