./x.py check

[nikomatsakis]

So I've recently discovered that ./x.py check is actually really dang fast -- we should add a note about it in the "how to build compiler" section. It's in particular very useful when you're doing some kind of "type-based refactoring", like renaming a method, or changing the signature of some function.

[rajcspsg]

@nikomatsakis @mark-i-m - can I take this easy issue?

[mark-i-m]

Go for it :)

[rajcspsg]

@nikomatsakis - I've updated the this file correct?
Also, I see the document has already something related to x.py build command for rustc.

[rajcspsg]

@nikomatsakis @mark-i-m - I see documentation related to https://forge.rust-lang.org/x-py.html.
Do I've to move the contents here as mentioned in this issue 98?

[mark-i-m]

I've updated the this file correct?
Also, I see the document has already something related to x.py build command for rustc.

Yep, that's the right file. It already had content on some of the other x.py commands, but not for check.

I see documentation related to https://forge.rust-lang.org/x-py.html.
Do I've to move the contents here as mentioned in this issue 98?

Hmm... I think it would be good to do, but not in this PR. I also think it is distinct from #98... Could you open a new issue for it?

[rajcspsg]

@mark-i-m

I will update the below content in that file. Please let me know if it is fine.

`./x.py check` is really fast to build the rust compiler. 
It is, in particular, very useful when you're doing some kind of "type-based refactoring", like renaming a method, or changing the signature of some function.

Also, I will open new issue move copying contents from https://forge.rust-lang.org/x-py.html.

[mark-i-m]

Ping @rajcspsg Any updates?

[rajcspsg]

@mark-i-m Sorry for delay. I didn't noticed when you 👍 my comment.
I've created PR for this issue #129.

[rajcspsg]

@mark-i-m I've created new issue #130 for documentation from https://forge.rust-lang.org/x-py.html.

[mark-i-m]

@rajcspsg Thanks!