diff options
Diffstat (limited to 'src/libsyntax/ext')
| -rw-r--r-- | src/libsyntax/ext/deriving/rand.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libsyntax/ext/deriving/rand.rs b/src/libsyntax/ext/deriving/rand.rs index 9fd5091e194..ec6eb9bee61 100644 --- a/src/libsyntax/ext/deriving/rand.rs +++ b/src/libsyntax/ext/deriving/rand.rs @@ -24,6 +24,10 @@ pub fn expand_deriving_rand<F>(cx: &mut ExtCtxt, push: F) where F: FnOnce(P<Item>), { + cx.span_warn(span, + "`#[derive(Rand)]` is deprecated in favour of `#[derive_Rand]` from \ + `rand_macros` on crates.io"); + let trait_def = TraitDef { span: span, attributes: Vec::new(), |