Do not run lints that cannot emit

Before this change, adding a lint was a difficult matter
because it always had some overhead involved. This was
because all lints would run, no matter their default level,
or if the user had #![allow]ed them. This PR changes that

Author: blyxyas

clippy_lints/src/asm_syntax.rs

@@ -3,7 +3,7 @@ use std::fmt;
 use clippy_utils::diagnostics::span_lint_and_then;
 use rustc_ast::ast::{Expr, ExprKind, InlineAsmOptions};
 use rustc_ast::{InlineAsm, Item, ItemKind};
-use rustc_lint::{EarlyContext, EarlyLintPass, Lint, LintContext};
+use rustc_lint::{EarlyContext, EarlyLintPass, Lint, LintPass, LintContext};
 use rustc_session::declare_lint_pass;
 use rustc_span::Span;
 use rustc_target::asm::InlineAsmArch;

clippy_lints/src/utils/author.rs renamed to clippy_lints/src/utils/internal_lints/author.rs

@@ -12,7 +12,7 @@ use rustc_span::symbol::{Ident, Symbol};
 use std::cell::Cell;
 use std::fmt::{Display, Formatter, Write as _};
 
-declare_lint_pass!(
+declare_clippy_lint!{
     /// ### What it does
     /// Generates clippy code that detects the offending pattern
     ///
@@ -44,8 +44,13 @@ declare_lint_pass!(
     ///     // report your lint here
     /// }
     /// ```
-    Author => []
-);
+    #[clippy::version = "1.0.0"]
+    pub AUTHOR,
+    internal,
+    "The author lint, see documentation at <https://doc.rust-lang.org/nightly/clippy/development/adding_lints.html#author-lint>"
+};
+
+declare_lint_pass! { Author => [AUTHOR] }
 
 /// Writes a line of output with indentation added
 macro_rules! out {

clippy_lints/src/utils/mod.rs

@@ -1,4 +1,3 @@
-pub mod author;
 pub mod dump_hir;
 pub mod format_args_collector;
 #[cfg(feature = "internal")]

tests/ui/author.rs renamed to tests/ui-internal/author.rs

@@ -1,3 +1,5 @@
+#![warn(clippy::author)]
+
 fn main() {
     #[clippy::author]
     let x: char = 0x45 as char;