Fix conversions

Cargo.toml

@@ -25,6 +25,7 @@ either = "1.5"
 wabt = "0.7"
 lazy_static = "1.2"
 quickcheck = "0.7"
+typemap = "0.3"
 
 [badges]
 maintenance = { status = "experimental" }

src/lib.rs

@@ -7,6 +7,7 @@
     try_from,
     try_trait,
     bind_by_move_pattern_guards,
+    fnbox,
     copysign
 )]
 #![plugin(dynasm)]