Drop `identity` from prelude.

[rust.git] / CONTRIBUTING.md

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 2b389888e5185eb46675af9eb3a4a63cadeb04b5..ea9f2c194300507798ef377ea2f821035d82a5d1 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -47,6 +47,12 @@ as it's possible that someone else has already reported your error. This doesn't
 always work, and sometimes it's hard to know what to search for, so consider this
 extra credit. We won't mind if you accidentally file a duplicate report.
 
+Similarly, to help others who encountered the bug find your issue,
+consider filing an issue with a descriptive title, which contains information that might be unique to it.
+This can be the language or compiler feature used, the conditions that trigger the bug,
+or part of the error message if there is any.
+An example could be: **"impossible case reached" on lifetime inference for impl Trait in return position**.
+
 Opening an issue is as easy as following [this
 link](https://github.com/rust-lang/rust/issues/new) and filling out the fields.
 Here's a template that you can use to file a bug, though it's not necessary to
@@ -121,6 +127,7 @@ configuration used in the build process. Some options to note:
 #### `[rust]`:
 - `debuginfo = true` - Build a compiler with debuginfo. Makes building rustc slower, but then you can use a debugger to debug `rustc`.
 - `debuginfo-lines = true` - An alternative to `debuginfo = true` that doesn't let you use a debugger, but doesn't make building rustc slower and still gives you line numbers in backtraces.
+- `debuginfo-tools = true` - Build the extended tools with debuginfo.
 - `debug-assertions = true` - Makes the log output of `debug!` work.
 - `optimize = false` - Disable optimizations to speed up compilation of stage1 rust, but makes the stage1 compiler x100 slower.
 
@@ -135,6 +142,8 @@ file. If you still have a `config.mk` file in your directory - from
 ### Building
 [building]: #building
 
+A default configuration requires around 3.5 GB of disk space, whereas building a debug configuration may require more than 30 GB.
+
 Dependencies
 - [build dependencies](README.md#building-from-source)
 - `gdb` 6.2.0 minimum, 7.1 or later recommended for test builds
@@ -594,7 +603,7 @@ If you're looking for somewhere to start, check out the [E-easy][eeasy] tag.
 [inom]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AI-nominated
 [eeasy]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AE-easy
 [lru]: https://github.com/rust-lang/rust/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-asc
-[rfcbot]: https://github.com/dikaiosune/rust-dashboard/blob/master/RFCBOT.md
+[rfcbot]: https://github.com/anp/rfcbot-rs/
 
 ## Out-of-tree Contributions
 [out-of-tree-contributions]: #out-of-tree-contributions