Add a field `borrow_offset` to the type descriptor indicating

what amount a T* pointer must be adjusted to reach the contents
of the box. For `~T` types, this requires knowing the type `T`,
which is not known in the case of objects.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/librustc/back/abi.rs b/src/librustc/back/abi.rs
index 05b6e90c682..dae0ceed22d 100644
--- a/src/librustc/back/abi.rs
+++ b/src/librustc/back/abi.rs
@@ -46,7 +46,8 @@ pub static tydesc_field_take_glue: uint = 2u;
 pub static tydesc_field_drop_glue: uint = 3u;
 pub static tydesc_field_free_glue: uint = 4u;
 pub static tydesc_field_visit_glue: uint = 5u;
-pub static n_tydesc_fields: uint = 6u;
+pub static tydesc_field_borrow_offset: uint = 6u;
+pub static n_tydesc_fields: uint = 7u;
 
 // The two halves of a closure: code and environment.
 pub static fn_field_code: uint = 0u;