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format examples better (#471)

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Tshepang Lekhonkhobe 2019-10-18 02:03:46 +02:00 committed by Santiago Pastorino
parent 0a2e1b74df
commit c46ab305be
1 changed files with 14 additions and 14 deletions
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src/implementing_new_features.md
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@ -125,26 +125,26 @@ a new unstable feature:
2. Pick a name for the feature gate (for RFCs, use the name
in the RFC).
3. Add a feature gate declaration to `libsyntax/active.rs`
3. Add a feature gate declaration to `libsyntax/feature_gate/active.rs`
in the active `declare_features` block:
```rust,ignore
// description of feature
(active, $feature_name, "$current_nightly_version", Some($tracking_issue_number), $edition)
```
```rust,ignore
// description of feature
(active, $feature_name, "$current_nightly_version", Some($tracking_issue_number), $edition)
```
where `$edition` has the type `Option<Edition>`, and is typically
just `None`.
where `$edition` has the type `Option<Edition>`, and is typically
just `None`.
For example:
For example:
```rust,ignore
// allow '|' at beginning of match arms (RFC 1925)
( active, match_beginning_vert, "1.21.0", Some(44101), None),
```
```rust,ignore
/// Allows defining identifiers beyond ASCII.
(active, non_ascii_idents, "1.0.0", Some(55467), None),
```
When added, the current version should be the one for the current nightly.
Once the feature is moved to `accepted.rs`, the version is changed to that nightly version.
When added, the current version should be the one for the current nightly.
Once the feature is moved to `accepted.rs`, the version is changed to that nightly version.
4. Prevent usage of the new feature unless the feature gate is set.
You can check it in most places in the compiler using the