Renumber error to fix tidy

src/librustc_typeck/check/compare_method.rs

@@ -739,7 +739,7 @@ fn compare_synthetic_generics<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
             let trait_span = tcx.hir.span(trait_node_id);
             let mut err = struct_span_err!(tcx.sess,
                                            impl_span,
-                                           E0642,
+                                           E0643,
                                            "method `{}` has incompatible signature for trait",
                                            trait_m.name);
             err.span_label(trait_span, "annotation in trait");

src/librustc_typeck/diagnostics.rs

@@ -4625,11 +4625,11 @@ It is recommended that you look for a `new` function or equivalent in the
 crate's documentation.
 "##,
 
-E0642: r##"
+E0643: r##"
 This error indicates that there is a mismatch between generic parameters and
 impl Trait parameters in a trait declaration versus its impl.
 
-```compile_fail,E0642
+```compile_fail,E0643
 #![feature(universal_impl_trait)]
 trait Foo {
     fn foo(&self, _: &impl Iterator);