Crash in glue$copy$$g14$t1$P1

[pcwalton]

When running rustc on my repo, which has an AST parameterized over an arbitrary type T, I get:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x0000000c
0x000bb46c in glue$copy$$g14$t1$P1 ()
(gdb) bt
0  0x000bb46c in glue$copy$$g14$t1$P1 ()
1  0x003026e0 in ?? ()

Even an empty source file passed to rustc triggers the error.

[graydon]

WONTFIX (not required for bootstrapping, also I think long since obsolete)