rp.is_none ICE when using 'self lifetime name inappropriately(?) #6396

use core::str;

fn foo<'self>(s: &'self str) -> str::StrCharIterator<'self> {s.char_iter()}

$ RUST_LOG=rustc=1,::rt::backtrace rustc --lib ice_debug/ice1.rs
rust: task failed at 'assertion failed: rp.is_none()', /home/devin/local_programming/rust/src/librustc/middle/typeck/collect.rs:1070
/usr/local/bin/../lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x4b)[0x7fc622995ccb]
/usr/local/bin/../lib/librustrt.so(+0x2c869)[0x7fc6229a6869]
/usr/local/bin/../lib/librustrt.so(upcall_fail+0x1a0)[0x7fc622997c80]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(_ZN3sys13begin_unwind_16_615cb041c655a976_07preE+0x63)[0x7fc6262fb963]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0x1298f2)[0x7fc6262fb8f2]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(_ZN3sys14__extensions__9meth_89249fail_with17_ac9eb45dc42bd6906_07preE+0x6b)[0x7fc62623a8eb]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle6typeck7collect10ty_of_item17_d137c315966677236_07preE+0x2841)[0x7fc624bcbe91]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle6typeck7collect7convert16_1a2bf85beff75cb6_07preE+0x545)[0x7fc624bc6cf5]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x6bc6db)[0x7fc624bc66db]
/usr/local/bin/../lib/libsyntax-84efebcb12c867a2-0.7-pre.so(+0xfdfd7)[0x7fc625565fd7]
/usr/local/bin/../lib/libsyntax-84efebcb12c867a2-0.7-pre.so(+0xf5b42)[0x7fc62555db42]
/usr/local/bin/../lib/libsyntax-84efebcb12c867a2-0.7-pre.so(+0x76629)[0x7fc6254de629]
/usr/local/bin/../lib/libsyntax-84efebcb12c867a2-0.7-pre.so(+0xfd5cc)[0x7fc6255655cc]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x2e08e1)[0x7fc6247ea8e1]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle6typeck7collect18collect_item_types17_74ef7a78d270e44c6_07preE+0x4a5)[0x7fc624bc3dd5]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x7149a2)[0x7fc624c1e9a2]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x7147f9)[0x7fc624c1e7f9]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle6typeck11check_crate17_c84fb58afee883786_07preE+0x1d0)[0x7fc624c1bdc0]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6driver6driver12compile_rest17_819c62971b10988b6_07preE+0x1555)[0x7fc624f36705]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6driver6driver12compile_upto15_bb4dc350e2dbf46_07preE+0x192)[0x7fc624f3c962]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6driver6driver13compile_input17_fa1f24ad298485546_07preE+0x107)[0x7fc624f3cde7]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN12run_compiler17_91176f6b8a4d83ae6_07preE+0x2aec)[0x7fc624f69fbc]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0xa7242e)[0x7fc624f7c42e]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0xa6febc)[0x7fc624f79ebc]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0xa69e0c)[0x7fc624f73e0c]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0xa72708)[0x7fc624f7c708]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0xf1f5d)[0x7fc6262c3f5d]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0x16f338)[0x7fc626341338]
/usr/local/bin/../lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x7fc622996674]
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug
note: try running with RUST_LOG=rustc=1,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues
rust: task failed at 'explicit failure', /home/devin/local_programming/rust/src/librustc/rustc.rc:355
/usr/local/bin/../lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x4b)[0x7fc622995ccb]
/usr/local/bin/../lib/librustrt.so(+0x2c869)[0x7fc6229a6869]
/usr/local/bin/../lib/librustrt.so(upcall_fail+0x1a0)[0x7fc622997c80]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(_ZN3sys13begin_unwind_16_615cb041c655a976_07preE+0x63)[0x7fc6262fb963]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0x129a12)[0x7fc6262fba12]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0xc8514)[0x7fc62629a514]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN7monitor17_7c89c43af55f627f6_07preE+0x2385)[0x7fc624f6d545]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0xa72708)[0x7fc624f7c708]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN4main15_c4de63b748e03d6_07preE+0x69)[0x7fc624f7c369]
rustc(_rust_main+0x2e)[0x400c8e]
/usr/local/bin/../lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x7fc622996674]
rust: domain main @0x125c410 root task failed