---

yaml
---
r: 216742
b: refs/heads/stable
c: 11a7bad
h: refs/heads/master
v: v3

Author: Nick Hamann

[refs]

@@ -29,5 +29,5 @@ refs/heads/tmp: 378a370ff2057afeb1eae86eb6e78c476866a4a6
 refs/tags/1.0.0-alpha.2: 4c705f6bc559886632d3871b04f58aab093bfa2f
 refs/tags/homu-tmp: a5286998df566e736b32f6795bfc3803bdaf453d
 refs/tags/1.0.0-beta: 8cbb92b53468ee2b0c2d3eeb8567005953d40828
-refs/heads/stable: 11cb5e50ab0fb166372d3aab68a06d5c06fdf2eb
+refs/heads/stable: 11a7bad97b79014aa145af11c6537843cb086b78
 refs/tags/1.0.0: 55bd4f8ff2b323f317ae89e254ce87162d52a375

branches/stable/src/librustc_typeck/diagnostics.rs

@@ -19,6 +19,21 @@ methods that do not have default implementations), as well as any required
 trait items like associated types or constants.
 "##,
 
+E0054: r##"
+It is not allowed to cast to a bool. If you are trying to cast a numeric type
+to a bool, you can compare it with zero instead:
+
+```
+let x = 5;
+
+// Ok
+let x_is_nonzero = x != 0;
+
+// Not allowed, won't compile
+let x_is_nonzero = x as bool;
+```
+"##,
+
 E0081: r##"
 Enum discriminants are used to differentiate enum variants stored in memory.
 This error indicates that the same value was used for two or more variants,
@@ -116,7 +131,6 @@ register_diagnostics! {
     E0049,
     E0050,
     E0053,
-    E0054,
     E0055,
     E0057,
     E0059,