Why should an uppercase variable (defined by macro expansion) cause an out-of-bounds ICE? Although this was on rustc 0.11.0-pre (b47f2226a25654c5b781d27a91f2fa5274b3a347 2014-06-28 14:31:37 +0000), rather than current master rustc.

gistfile1.txt

ovid $ git ll -1 --oneline
* 220b83a (HEAD, master) now naming the column [singular]
ovid $ 
ovid $ git diff
diff --git a/CSVSample.rs b/CSVSample.rs
index 9e57175..4e279c4 100644
--- a/CSVSample.rs
+++ b/CSVSample.rs
@@ -3,7 +3,6 @@
 
 #![allow(unused_imports)]
 #![allow(unused_variable)]
-#![allow(uppercase_variables)]
 
 #![feature(phase)]
 
ovid $ 
ovid $ ./build.sh 
provide_csv_given_labels: name:   MyCSV
provide_csv_given_labels: path:   ./sample1.txt
provide_csv_given_labels: labels: Verse
Defining items in the CSV provider...
OK
<quote expansion>:1:1: 44:60 warning: structure field names should start with a lowercase character, #[warn(uppercase_variables)] on by default
<quote expansion>:1 Verse
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'index out of bounds: the len is 1 but the index is 1', /Users/kevin/code/rust/src/libsyntax/lib.rs:1


ovid $ 
ovid $ cat build.sh 
#!/bin/sh

rustc CSVProvider.rs \
&& rustc --test -L . CSVSample.rs \
&& ./CSVSample
#&& RUST_BACKTRACE=1 rustc --test -L . CSVSample.rs \
#&& rustc --test -L . --pretty expanded CSVSample.rs
ovid $ 
ovid $