Generic inner functions declared inside closures don't get ASTs exported

[bblum]

rust: upcall fail 'lookup_item: id not found: 52136', /home/bblum/rust/src/rustc/metadata/decoder.rs:96
error: internal compiler error: unexpected failure

Code that worked fine looked like:

unsafe fn ... {
unsafe fn ... { ... }
...map {|...|
...
}
}

Code that produced the crash:

unsafe fn ... {
...map {|...|
unsafe fn ... { ... }
...
}
}

Didn't bother testing without the 'unsafe's.

[catamorphism]

In general, the most helpful test case for reproducing a bug is one that the person reading the issue can copy and paste into a new file and compile with no extra effort. If it's a cross-crate bug, provide the contents of each file. It's usually not much extra effort to do this and it saves time for the person reading the bug report days or weeks later :-)

[catamorphism]

The test case I made up based on the template above compiles without error. I'm checking it in, but I'm not sure whether the bug was accidentally fixed or whether my test case was wrong. I'm closing this, but feel free to reopen if you have a stand-alone test case that reproduces the bug.