add MapExpect to Result

add DebugInspect to Result

move Result typedef into unit

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/result.rs

@@ -0,0 +1,6 @@
+mod debug_inspect;
+mod map_expect;
+
+pub use self::{debug_inspect::DebugInspect, map_expect::MapExpect};
+
+pub type Result<T = (), E = crate::Error> = std::result::Result<T, E>;