Make WasmError and WasmResult public types.

lib/wasm/src/environ/spec.rs

@@ -35,7 +35,9 @@ pub enum WasmError {
     /// code. This should never happen for validated WebAssembly code.
     #[fail(display = "Invalid input WebAssembly code at offset {}: {}", _1, _0)]
     InvalidWebAssembly {
+        /// A string describing the validation error.
         message: &'static str,
+        /// The bytecode offset where the error occurred.
         offset: usize,
     },
 

lib/wasm/src/lib.rs

@@ -53,7 +53,8 @@ mod sections_translator;
 mod state;
 mod translation_utils;
 
-pub use environ::{DummyEnvironment, FuncEnvironment, GlobalValue, ModuleEnvironment};
+pub use environ::{DummyEnvironment, FuncEnvironment, GlobalValue, ModuleEnvironment, WasmError,
+                  WasmResult};
 pub use func_translator::FuncTranslator;
 pub use module_translator::translate_module;
 pub use translation_utils::{FunctionIndex, Global, GlobalIndex, GlobalInit, Memory, MemoryIndex,