Fix Result not fully-qualified causing errors when ambiguous

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "castaway"
-version = "0.1.0"
+version = "0.1.1"
 description = "Safe, zero-cost downcasting for limited compile-time specialization."
 authors = ["Stephen M. Coakley <[email protected]>"]
 license = "MIT"

src/lib.rs

@@ -139,7 +139,7 @@ macro_rules! cast {
         // thus are preferred by the compiler if applicable.
         let value = $value;
         let token = CastToken::of_val(&value);
-        let result: Result<$T, _> = (&&&token).try_cast(value);
+        let result: ::core::result::Result<$T, _> = (&&&token).try_cast(value);
 
         result
     }};