Move some common code into check_struct_path
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2859f8bf39
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@ -495,9 +495,9 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
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expected: Ty<'tcx>)
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{
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// Resolve the path and check the definition for errors.
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let def = self.finish_resolving_struct_path(path, pat.id, pat.span);
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let variant = if let Some(variant) = self.check_struct_path(def, path, pat.span) {
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variant
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let (variant, pat_ty) = if let Some(variant_ty) = self.check_struct_path(path, pat.id,
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pat.span) {
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variant_ty
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} else {
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self.write_error(pat.id);
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for field in fields {
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@ -507,7 +507,6 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
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};
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// Type check the path.
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let pat_ty = self.instantiate_type_path(def.def_id(), path, pat.id);
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self.demand_eqtype(pat.span, expected, pat_ty);
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// Type check subpatterns.
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@ -3122,10 +3122,11 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
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}
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pub fn check_struct_path(&self,
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def: Def,
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path: &hir::Path,
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node_id: ast::NodeId,
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span: Span)
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-> Option<ty::VariantDef<'tcx>> {
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-> Option<(ty::VariantDef<'tcx>, Ty<'tcx>)> {
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let def = self.finish_resolving_struct_path(path, node_id, span);
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let variant = match def {
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Def::Err => {
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self.set_tainted_by_errors();
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@ -3151,7 +3152,9 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
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pprust::path_to_string(path));
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return None;
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}
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variant
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let ty = self.instantiate_type_path(def.def_id(), path, node_id);
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Some((variant.unwrap(), ty))
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}
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fn check_expr_struct(&self,
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@ -3161,16 +3164,14 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
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base_expr: &'gcx Option<P<hir::Expr>>)
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{
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// Find the relevant variant
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let def = self.finish_resolving_struct_path(path, expr.id, expr.span);
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let variant = if let Some(variant) = self.check_struct_path(def, path, expr.span) {
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variant
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let (variant, expr_ty) = if let Some(variant_ty) = self.check_struct_path(path, expr.id,
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expr.span) {
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variant_ty
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} else {
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self.check_struct_fields_on_error(expr.id, fields, base_expr);
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return;
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};
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let expr_ty = self.instantiate_type_path(def.def_id(), path, expr.id);
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self.check_expr_struct_fields(expr_ty, path.span, variant, fields,
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base_expr.is_none());
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if let &Some(ref base_expr) = base_expr {
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