---

yaml
---
r: 206551
b: refs/heads/beta
c: 11a7bad
h: refs/heads/master
i:
  206549: 362690e
  206547: 5a07a82
  206543: e551812
v: v3

Author: Nick Hamann

[refs]

@@ -29,7 +29,7 @@ refs/tags/0.12.0: f0c419429ef30723ceaf6b42f9b5a2aeb5d2e2d1
 refs/heads/automation-fail: 1bf06495443584539b958873e04cc2f864ab10e4
 refs/heads/batch: b7fd822592a4fb577552d93010c4a4e14f314346
 refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
-refs/heads/beta: 11cb5e50ab0fb166372d3aab68a06d5c06fdf2eb
+refs/heads/beta: 11a7bad97b79014aa145af11c6537843cb086b78
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: 579e31929feff51dcaf8d444648eff8de735f91a

branches/beta/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,