EnumSet assertion: better error message.

SimonSapin · SimonSapin · commit a22772d6a600 · 2014-11-06T18:16:17.000-08:00
diff --git a/src/libcollections/enum_set.rs b/src/libcollections/enum_set.rs
@@ -52,8 +52,10 @@ pub trait CLike {
 }
 
 fn bit<E:CLike>(e: &E) -> uint {
+    use core::uint;
     let value = e.to_uint();
-    assert!(value < ::core::uint::BITS);
+    assert!(value < uint::BITS,
+            "EnumSet only supports up to {} variants.", uint::BITS - 1);
     1 << value
 }
 

Original file line number	Diff line number	Diff line change
`@@ -52,8 +52,10 @@ pub trait CLike {`
`52`	`52`	`}`
`53`	`53`
`54`	`54`	`fn bit<E:CLike>(e: &E) -> uint {`
	`55`	`+ use core::uint;`
`55`	`56`	`let value = e.to_uint();`
`56`		`- assert!(value < ::core::uint::BITS);`
	`57`	`+ assert!(value < uint::BITS,`
	`58`	`+ "EnumSet only supports up to {} variants.", uint::BITS - 1);`
`57`	`59`	`1 << value`
`58`	`60`	`}`
`59`	`61`