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Don't run unused variable pass for stuff generated by #[derive()]

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This commit is contained in:
Manish Goregaokar 2018-04-04 18:16:44 -07:00 • committed by James Sanderson
parent 4ae9488ce8
commit 24d410abd6
1 changed files with 11 additions and 0 deletions
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11
src/librustc/middle/liveness.rs
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@ -184,6 +184,7 @@ impl<'a, 'tcx> Visitor<'tcx> for IrMaps<'a, 'tcx> {
b: hir::BodyId, s: Span, id: NodeId) {
visit_fn(self, fk, fd, b, s, id);
}
fn visit_local(&mut self, l: &'tcx hir::Local) { visit_local(self, l); }
fn visit_expr(&mut self, ex: &'tcx Expr) { visit_expr(self, ex); }
fn visit_arm(&mut self, a: &'tcx hir::Arm) { visit_arm(self, a); }
@ -361,6 +362,16 @@ fn visit_fn<'a, 'tcx: 'a>(ir: &mut IrMaps<'a, 'tcx>,
// swap in a new set of IR maps for this function body:
let mut fn_maps = IrMaps::new(ir.tcx);
// Don't run unused pass for #[derive()]
if let FnKind::Method(..) = fk {
let parent = ir.tcx.hir.get_parent(id);
if let Some(hir::map::Node::NodeItem(i)) = ir.tcx.hir.find(parent) {
if i.attrs.iter().any(|a| a.check_name("automatically_derived")) {
return;
}
}
}
debug!("creating fn_maps: {:?}", &fn_maps as *const IrMaps);
let body = ir.tcx.hir.body(body_id);