"unknown scope" error on mutable borrowed pointer

[jbclements]

This code

fn main () {
    let mut p: & int = & 4;
    p = ~3;
}

Produces this error:

foo.rs:2:12: 2:14 warning: variable `p` is assigned to, but never used
foo.rs:2     let mut p: & int = & 3;
                     ^~
foo.rs:3:4: 3:5 warning: value assigned to `p` is never read
foo.rs:3     p = ~3;
             ^
foo.rs:3:8: 3:10 error: illegal borrow: borrowed value does not live long enough
foo.rs:3     p = ~3;
                 ^~
foo.rs:1:11: 4:1 note: borrowed pointer must be valid for the block at 1:11...
foo.rs:1 fn main () {
foo.rs:2     let mut p: & int = & 3;
foo.rs:3     p = ~3;
foo.rs:4 }
note: ...but borrowed value is only valid for unknown scope: 22.  Please report a bug.
error: aborting due to previous error

[catamorphism]

I think this is the same as #3860, and I'll test it once I have my fix for that one ready (so... close...!)

[catamorphism]

Oh, this is related to #3860 but not quite the same. The code that prints out scopes doesn't handle the case where the scope is associated with a statement ID. This shouldn't be hard to fix.

[catamorphism]

Fixed in 96b4f43