Duplicate crate errors with #[phase(syntax)]

[alexcrichton]

#![feature(phase)]

#[phase(syntax, link)] extern crate std;

warning: using multiple versions of crate `std`
foo.rs:1:1: 1:1 note: used here
foo.rs:1 #![feature(phase)]
         ^
note: crate_id: std#0.11.0-pre
foo.rs:3:24: 3:41 note: used here
foo.rs:3 #[phase(syntax, link)] extern crate std;
                                ^~~~~~~~~~~~~~~~~
note: crate_id: std#0.11.0-pre
error: duplicate entry for `malloc`
error: duplicate entry for `free`
error: duplicate entry for `strdup_uniq`
error: duplicate entry for `eh_personality`
error: duplicate entry for `managed_heap`
error: duplicate entry for `gc`
error: aborting due to 6 previous errors

This should link in the same version of libstd, not two separate versions.

[lilyball]

Curiously, the following works:

#![feature(phase)]
#[phase(syntax)]
extern crate std;

And the following works:

#![feature(phase)]
#[phase(link)]
extern crate std;

It's only the combination #[phase(syntax,link)] that fails.