Require lints to be Send + Sync

Author: Zoxc

src/librustc/lint/mod.rs

@@ -31,7 +31,7 @@
 pub use self::Level::*;
 pub use self::LintSource::*;
 
-use rustc_data_structures::sync::Lrc;
+use rustc_data_structures::sync::{self, Lrc};
 
 use errors::{DiagnosticBuilder, DiagnosticId};
 use hir::def_id::{CrateNum, LOCAL_CRATE};
@@ -287,8 +287,9 @@ pub trait EarlyLintPass: LintPass {
 }
 
 /// A lint pass boxed up as a trait object.
-pub type EarlyLintPassObject = Box<dyn EarlyLintPass + 'static>;
-pub type LateLintPassObject = Box<dyn for<'a, 'tcx> LateLintPass<'a, 'tcx> + 'static>;
+pub type EarlyLintPassObject = Box<dyn EarlyLintPass + sync::Send + sync::Sync + 'static>;
+pub type LateLintPassObject = Box<dyn for<'a, 'tcx> LateLintPass<'a, 'tcx> + sync::Send
+                                                                           + sync::Sync + 'static>;
 
 /// Identifies a lint known to the compiler.
 #[derive(Clone, Copy, Debug)]