register.rs: store context in error after str::parse()

src/parser/instruction/encoding/register.rs

@@ -4,7 +4,6 @@ use super::*;
 use std::str::FromStr;
 
 /// A [Register] epresents [one of the MSP430 processor's registers](https://mspgcc.sourceforge.net/manual/x82.html)
-
 #[allow(non_camel_case_types)]
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum Register {
@@ -33,7 +32,12 @@ pub enum Register {
 impl Parsable for Register {
     fn parse<'text, T>(_: &Parser, stream: &mut T) -> Result<Self, Error>
     where T: crate::TokenStream<'text> {
-        stream.expect(Type::Register).map_err(|e| e.context(stream.context()))?.lexeme().parse()
+        stream
+            .expect(Type::Register)
+            .map_err(|e: Error| e.context(stream.context()))?
+            .lexeme()
+            .parse()
+            .map_err(|e: Error| e.context(stream.context()))
     }
 }