diagnostic: Refactor Error class

The class now allows for more variants including a `Hint` one which
then gets emitted by calling `rust_inform`. This allows us to display
hints/tips/notes in backtracking contexts such as the parser.

gcc/rust/ChangeLog:

	* rust-diagnostics.h (struct Error): Add new Kind enum and various new
	static constructors to allow for hints as well.
	* rust-diagnostics.cc (Error::Error): Use new `kind` field properly.
	* checks/errors/privacy/rust-visibility-resolver.cc
	(VisibilityResolver::resolve_module_path): Use new Error API.
	* expand/rust-macro-builtins.cc (MacroBuiltin::include_handler): Likewise.
	* expand/rust-macro-expand.cc (parse_many): Likewise.
	(transcribe_type): Likewise.
	* parse/rust-parse-impl.h (Parser::parse_crate): Likewise.
	* rust-session-manager.cc (Session::handle_crate_name): Likewise.
	* ast/rust-ast.cc (Module::load_items): Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/rust/parse/rust-parse-impl.h b/gcc/rust/parse/rust-parse-impl.h
index cc5436c..6a98bcc 100644
--- a/gcc/rust/parse/rust-parse-impl.h
+++ b/gcc/rust/parse/rust-parse-impl.h
@@ -444,7 +444,7 @@ Parser<ManagedTokenSource>::parse_crate ()
 
   // emit all errors
   for (const auto &error : error_table)
-    error.emit_error ();
+    error.emit ();
 
   return std::unique_ptr<AST::Crate> (
     new AST::Crate (std::move (items), std::move (inner_attrs)));