Express contracts as part of function header and lower it to the contract lang items

includes post-developed commit: do not suggest internal-only keywords as corrections to parse failures.

includes post-developed commit: removed tabs that creeped in into rustfmt tool source code.

includes post-developed commit, placating rustfmt self dogfooding.

includes post-developed commit: add backquotes to prevent markdown checking from trying to treat an attr as a markdown hyperlink/

includes post-developed commit: fix lowering to keep contracts from being erroneously inherited by nested bodies (like closures).

Rebase Conflicts:
 - compiler/rustc_parse/src/parser/diagnostics.rs
 - compiler/rustc_parse/src/parser/item.rs
 - compiler/rustc_span/src/hygiene.rs

Remove contracts keywords from diagnostic messages

compiler/rustc_builtin_macros/src/alloc_error_handler.rs

@@ -85,6 +85,7 @@ fn generate_handler(cx: &ExtCtxt<'_>, handler: Ident, span: Span, sig_span: Span
         defaultness: ast::Defaultness::Final,
         sig,
         generics: Generics::default(),
+        contract: None,
         body,
     }));
 

compiler/rustc_builtin_macros/src/deriving/generic/mod.rs

@@ -1034,6 +1034,7 @@ impl<'a> MethodDef<'a> {
                 defaultness,
                 sig,
                 generics: fn_generics,
+                contract: None,
                 body: Some(body_block),
             })),
             tokens: None,

compiler/rustc_builtin_macros/src/global_allocator.rs

@@ -81,6 +81,7 @@ impl AllocFnFactory<'_, '_> {
             defaultness: ast::Defaultness::Final,
             sig,
             generics: Generics::default(),
+            contract: None,
             body,
         }));
         let item = self.cx.item(

compiler/rustc_builtin_macros/src/test_harness.rs

@@ -344,6 +344,7 @@ fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
         defaultness,
         sig,
         generics: ast::Generics::default(),
+        contract: None,
         body: Some(main_body),
     }));