missing_doc lint only accepts sugared docs

[sfackler]

The program

//! whatever

#[link(name="test")];
#[feature(macro_rules)];
#[warn(missing_doc)];

#[doc="foo"]
pub struct Foo;

throws a warning when processed:

~ ❯ rustdoc test.rs
test.rs:8:0: 8:15 warning: missing documentation for a struct
test.rs:8 pub struct Foo;
          ^~~~~~~~~~~~~~~
test.rs:5:7: 5:18 note: lint level defined here
test.rs:5 #[warn(missing_doc)];
                 ^~~~~~~~~~~

[sfackler]

Turns out that missing_doc just doesn't check for unsugared docs at all.

[alexcrichton]

If only we could have a turnaround time of 7 hours for all bugs!