Panic in libsyntax/ext/quote.rs

[SeanRBurton]

Using a macro argument (e.g. $x) inside of quote_expr! causes an internal compiler error.

Testcase

#![feature(quote)]                                                              
fn main() {                                                                     
    macro_rules! foo {                                                          
        ($bar:expr)  => {{                                                      
            quote_expr!(cx, {                                                   
                $bar                                                            
            })                                                                  
        }}                                                                      
    }                                                                           
    foo!(0);                                                                    
}                                                                               

Meta

rustc --version --verbose:

rustc 1.5.0-nightly (32a8567 2015-10-05)
binary: rustc
commit-hash: 32a8567
commit-date: 2015-10-05
host: x86_64-unknown-linux-gnu
release: 1.5.0-nightly

Backtrace:

1: 0x7f99dd582940 - sys::backtrace::tracing::imp::write::he27ef2eb40e30753Plt
2: 0x7f99dd589215 - panicking::log_panic::::closure.39293
3: 0x7f99dd588c85 - panicking::log_panic::h20a17353a34447751lx
4: 0x7f99dd54d783 - sys_common::unwind::begin_unwind_inner::hf876a8bedc1a7d89gds
5: 0x7f99d72f3e3f - sys_common::unwind::begin_unwind::begin_unwind::h8566091144643397121
6: 0x7f99d75e3346 - ext::quote::expr_mk_token::h739fb902b08199ffVPe
7: 0x7f99d75e55eb - ext::quote::statements_mk_tt::hc13e258339eab598x3e
8: 0x7f99d75e88e0 - iter::::next::next::h11015572762128041720
9: 0x7f99d75e8148 - vec::::from_iter::from_iter::h13593900259474011105
10: 0x7f99d75e47e0 - ext::quote::statements_mk_tt::hc13e258339eab598x3e
11: 0x7f99d75df3bf - ext::quote::statements_mk_tts::ha204cd8774c6b5cbPff
12: 0x7f99d75dcf39 - ext::quote::expand_tts::h9307c2288d757f70Kgf
13: 0x7f99d75de3dc - ext::quote::expand_parse_call::h5e17b10e57da8b04rjf
14: 0x7f99d74d4d9d - ext::quote::expand_quote_expr::h46e9f6ebc9a4485azFe
15: 0x7f99d74d82f8 - ext::base::::expand::h16087092572269147898
16: 0x7f99d753a46b - ext::expand::expand_expr::::closure.68518
17: 0x7f99d7536ebf - ext::expand::expand_expr::h14fbac08b20b87c28mb
18: 0x7f99d757d9be - ext::expand::expand_block_elts::::closure.69190
19: 0x7f99d7546fe3 - ext::expand::expand_block_elts::h8d61523b3ef4a0eaVec
20: 0x7f99d757d578 - ext::expand::expand_block::h65394bbf166baee8gec
21: 0x7f99d75424fa - fold::noop_fold_expr::h7291925385286886789
22: 0x7f99d7537147 - ext::expand::expand_expr::::closure.68518
23: 0x7f99d7536ebf - ext::expand::expand_expr::h14fbac08b20b87c28mb
24: 0x7f99d7577b88 - fold::noop_fold_stmt::h12973173759275708851
25: 0x7f99d755a968 - ext::expand::expand_stmt::hd9da59f648bb2e0513b
26: 0x7f99d755d223 - iter::::next::next::h14693761281653209511
27: 0x7f99d755cc67 - util::small_vector::::from_iter::h2230188101519163904
28: 0x7f99d755bc1c - ext::expand::expand_stmt::hd9da59f648bb2e0513b
29: 0x7f99d757e87e - ext::expand::expand_block_elts::::::closure.69195
30: 0x7f99d757e61d - iter::::next::next::h7445701304088993935
31: 0x7f99d757dcdf - vec::::from_iter::from_iter::h1124164702553681919
32: 0x7f99d757d8dc - ext::expand::expand_block_elts::::closure.69190
33: 0x7f99d7546fe3 - ext::expand::expand_block_elts::h8d61523b3ef4a0eaVec
34: 0x7f99d757d578 - ext::expand::expand_block::h65394bbf166baee8gec
35: 0x7f99d7546981 - ext::expand::expand_and_rename_fn_decl_and_block::h0d444361d4f5f425XCc
36: 0x7f99d754c399 - ext::expand::expand_item_underscore::hc4243a869f3a877bGSb
37: 0x7f99d759d98e - fold::noop_fold_item_simple::h8462865063037887524
38: 0x7f99d759d4f0 - fold::noop_fold_item::h5328529649720349753
39: 0x7f99d754a650 - ext::expand::expand_annotatable::hcdfa58fbdd2db5e45oc
40: 0x7f99d7547178 - ext::expand::expand_item::h33ee80d897456d7c5Rb
41: 0x7f99d7552291 - iter::::next::next::h1430176632510595140
42: 0x7f99d7551e1e - vec::::from_iter::from_iter::h11440913854378754314
43: 0x7f99d7551b33 - fold::noop_fold_mod::h9501230011530116417
44: 0x7f99d754cc79 - ext::expand::expand_item_underscore::hc4243a869f3a877bGSb
45: 0x7f99d759d98e - fold::noop_fold_item_simple::h8462865063037887524
46: 0x7f99d759d4f0 - fold::noop_fold_item::h5328529649720349753
47: 0x7f99d754b709 - ext::expand::expand_annotatable::hcdfa58fbdd2db5e45oc
48: 0x7f99d7547178 - ext::expand::expand_item::h33ee80d897456d7c5Rb
49: 0x7f99d75a6c5f - ext::expand::expand_crate::h9eb355faa0bd8654MNc
50: 0x7f99dda8faec - driver::phase_2_configure_and_expand::::closure.27382
51: 0x7f99dda22b8d - driver::phase_2_configure_and_expand::h8ccfec5c5aca214aAua
52: 0x7f99dda10883 - driver::compile_input::h7f85a10f04a664a63ba
53: 0x7f99ddb6b19b - run_compiler::haabf54047e5bdb33wsc
54: 0x7f99ddb68a26 - boxed::::call_box::call_box::h4754854141470810202
55: 0x7f99ddb68334 - sys_common::unwind::try::try_fn::try_fn::h3587750331620889526
56: 0x7f99dd580668 - __rust_try
57: 0x7f99dd574deb - sys_common::unwind::try::inner_try::hbe46f56ef602f07cO9r
58: 0x7f99ddb684ce - boxed::::call_box::call_box::h8143133644679331252
59: 0x7f99dd587ce3 - sys::thread::::new::thread_start::h13325138c3b56c4cdEw
60: 0x7f99d6bec181 - start_thread
61: 0x7f99dd20547c - __clone
62: 0x0 -

[emoon]

I tested to build this as part of @steveklabnik list of ICE list.

On my version of Rust (rustc 1.4.0 (8ab8581 2015-10-27)) I don't get the issue so I wonder what the repro steps are?

I grabbed the repro above and switched to bugreport branch and built the code using cargo. So I wonder if there are some more steps here?

[SeanRBurton]

Sorry, I failed to mention that you have to build the regex_macros subcrate.

The code still causes an ICE as of rustc 1.5.0-nightly (32a8567 2015-10-05).

[SeanRBurton]

OK. I've generated a simple testcase which reproduces this bug.