Get rid of get_locus_slow

In various places there was the following hack:

  /* HACK: slow way of getting location from base expression through
     virtual methods. */
  virtual Location get_locus_slow () const { return Location (); }

The problem with get_locus_slow () is that if a subclass didn't
override it then there was no real location. get_locus_slow was
missing for Module, ExternCrate, UseDeclaration, Function, TypeAlias,
StructStruct, TupleStruct, Enum, Union, ConstantItem, StaticItem,
Trait, ImplBlock, ExternBlock, EmptyStmt, ExprStmtWithoutBlock and
ExprStmtWithBlock. All do have a get_locus () function.

Simply replace the get_locus_slow virtual method with a real virtual
Location get_locus () const = 0 method so we know if something
really doesn't have a location. This was only the case for
MacroRulesDefinition.

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/rust/resolve/rust-ast-verify-assignee.h b/gcc/rust/resolve/rust-ast-verify-assignee.h
index aed0119..9da3883 100644
--- a/gcc/rust/resolve/rust-ast-verify-assignee.h
+++ b/gcc/rust/resolve/rust-ast-verify-assignee.h
@@ -35,7 +35,7 @@ public:
     VerifyAsignee checker (parent);
     assignee->accept_vis (checker);
     if (!checker.ok)
-      rust_error_at (assignee->get_locus_slow (),
+      rust_error_at (assignee->get_locus (),
 		     "invalid left-hand side of assignment");
     return checker.ok;
   }