Allow subscripting raw pointers

This will be useful for dealing with vectors; regardless of our final solution
for the Index trait.

2016-07-06  Manish Goregaokar  <manish@mozilla.com>

gdb/ChangeLog:
    * rust-lang.c (rust_subscript): Allow subscripting pointers

gdb/testsuite/ChangeLog:
    * simple.rs: Add test for raw pointer subscripting
    * simple.exp: Add test expectations

1 files changed, 6 insertions, 0 deletions

diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 1849349..17b20c6 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -1415,6 +1415,12 @@ rust_subscript (struct expression *exp, int *pos, enum noside noside,
 	  low_bound = 0;
 	  high_bound = value_as_long (len);
 	}
+      else if (TYPE_CODE (type) == TYPE_CODE_PTR)
+	{
+	  base = lhs;
+	  low_bound = 0;
+	  high_bound = LONGEST_MAX;
+	}
       else
 	error (_("Cannot subscript non-array type"));