mir: store the span of a scope in the ScopeData.

Author: eddyb

src/librustc/mir/repr.rs

@@ -698,6 +698,7 @@ impl ScopeId {
 
 #[derive(Clone, Debug, RustcEncodable, RustcDecodable)]
 pub struct ScopeData {
+    pub span: Span,
     pub parent_scope: Option<ScopeId>,
 }
 

src/librustc/mir/visit.rs

@@ -298,9 +298,11 @@ macro_rules! make_mir_visitor {
             fn super_scope_data(&mut self,
                                 scope_data: & $($mutability)* ScopeData) {
                 let ScopeData {
+                    ref $($mutability)* span,
                     ref $($mutability)* parent_scope,
                 } = *scope_data;
 
+                self.visit_span(span);
                 if let Some(ref $($mutability)* parent_scope) = *parent_scope {
                     self.visit_scope_id(parent_scope);
                 }

src/librustc_mir/build/scope.rs

@@ -255,7 +255,9 @@ impl<'a,'tcx> Builder<'a,'tcx> {
         debug!("push_scope({:?})", extent);
         let parent_id = self.scopes.last().map(|s| s.id);
         let id = ScopeId::new(self.scope_datas.len());
+        let tcx = self.hir.tcx();
         self.scope_datas.push(ScopeData {
+            span: extent.span(&tcx.region_maps, &tcx.map).unwrap_or(DUMMY_SP),
             parent_scope: parent_id,
         });
         self.scopes.push(Scope {