Some changes to save-analysis to cope with errors

Author: Nick Cameron

src/librustc/middle/ty/mod.rs

@@ -1915,6 +1915,16 @@ impl<'tcx> ctxt<'tcx> {
         })
     }
 
+    pub fn expr_ty_adjusted_opt(&self, expr: &hir::Expr) -> Option<Ty<'tcx>> {
+        self.expr_ty_opt(expr).map(|t| t.adjust(self,
+                                                expr.span,
+                                                expr.id,
+                                                self.tables.borrow().adjustments.get(&expr.id),
+                                                |method_call| {
+            self.tables.borrow().method_map.get(&method_call).map(|method| method.ty)
+        }))
+    }
+
     pub fn expr_span(&self, id: NodeId) -> Span {
         match self.map.find(id) {
             Some(ast_map::NodeExpr(e)) => {

src/librustc_trans/save/dump_csv.rs

@@ -801,7 +801,7 @@ impl <'l, 'tcx> DumpCsvVisitor<'l, 'tcx> {
                 "<mutable>".to_string()
             };
             let types = self.tcx.node_types();
-            let typ = types.get(&id).unwrap().to_string();
+            let typ = types.get(&id).map(|t| t.to_string()).unwrap_or(String::new());
             // Get the span only for the name of the variable (I hope the path
             // is only ever a variable name, but who knows?).
             let sub_span = self.span.span_for_last_ident(p.span);

src/librustc_trans/save/mod.rs

@@ -463,11 +463,15 @@ impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
     }
 
     pub fn get_expr_data(&self, expr: &ast::Expr) -> Option<Data> {
+        let hir_node = lowering::lower_expr(self.lcx, expr);
+        let ty = self.tcx.expr_ty_adjusted_opt(&hir_node);
+        if ty.is_none() || ty.unwrap().sty == ty::TyError {
+            return None;
+        }
         match expr.node {
             ast::ExprField(ref sub_ex, ident) => {
                 let hir_node = lowering::lower_expr(self.lcx, sub_ex);
-                let ty = &self.tcx.expr_ty_adjusted(&hir_node).sty;
-                match *ty {
+                match self.tcx.expr_ty_adjusted(&hir_node).sty {
                     ty::TyStruct(def, _) => {
                         let f = def.struct_variant().field_named(ident.node.name);
                         let sub_span = self.span_utils.span_for_last_ident(expr.span);
@@ -487,8 +491,7 @@ impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
             }
             ast::ExprStruct(ref path, _, _) => {
                 let hir_node = lowering::lower_expr(self.lcx, expr);
-                let ty = &self.tcx.expr_ty_adjusted(&hir_node).sty;
-                match *ty {
+                match self.tcx.expr_ty_adjusted(&hir_node).sty {
                     ty::TyStruct(def, _) => {
                         let sub_span = self.span_utils.span_for_last_ident(path.span);
                         filter!(self.span_utils, sub_span, path.span, None);