Add error codes for librustc_typeck

Author: GuillaumeGomez

src/librustc_typeck/check/mod.rs

@@ -1308,9 +1308,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         match self.inh.locals.borrow().get(&nid) {
             Some(&t) => t,
             None => {
-                self.tcx().sess.span_err(
-                    span,
-                    &format!("no type for local variable {}", nid));
+                span_err!(self.tcx().sess, span, E0513,
+                          "no type for local variable {}",
+                          nid);
                 self.tcx().types.err
             }
         }

src/librustc_typeck/diagnostics.rs

@@ -3344,5 +3344,6 @@ register_diagnostics! {
            // type because its default value `{}` references the type `Self`"
     E0399, // trait items need to be implemented because the associated
            // type `{}` was overridden
-    E0436,  // functional record update requires a struct
+    E0436, // functional record update requires a struct
+    E0513, // no type for local variable ..
 }