Closed
Description
The error message by the compiler was, thread 'rustc' panicked at 'index out of bounds: the len is 73 but the index is 74', /rustc/91856ed52c58aa5ba66a015354d1cc69e9779bdf/src/libcore/slice/mod.rs:2539:10.
The code:
pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
let mut results = Vec::new();
for line in contents.lines() {
if line.contains(query) {
results.push(line);
}
}
results
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn one_result() {
let query = "duct";
let contents = "Rust:\nsafe, fast, productive.\nPick three.";
assert_eq!(vec!["safe, fast, productive."], search(query, contents));
}
}Changing the contents string literal to be formatted in the conventional way, i.e. without the manually inserted newline characters makes the code compile again (see below).
let contents = "\
Rust:
safe, fast, productive.
Pick three.";Meta
The complete error message
$ cargo test
Compiling minigrep v0.1.0 (/Users/snOm3ad/Desktop/rust/minigrep)
thread 'rustc' panicked at 'index out of bounds: the len is 73 but the index is 74', /rustc/91856ed52c58aa5ba66a015354d1cc69e9779bdf/src/libcore/slice/mod.rs:2539:10
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.34.0 (91856ed52 2019-04-10) running on x86_64-apple-darwin
note: compiler flags: -C debuginfo=2 -C incremental
note: some of the compiler flags provided by cargo are hidden
error: Could not compile `minigrep`.
warning: build failed, waiting for other jobs to finish...
error: build failed
The backtrace:
stack backtrace:
0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
1: std::sys_common::backtrace::_print
2: std::panicking::default_hook::{{closure}}
3: std::panicking::default_hook
4: rustc::util::common::panic_hook
5: std::panicking::rust_panic_with_hook
6: std::panicking::continue_panic_fmt
7: rust_begin_unwind
8: core::panicking::panic_fmt
9: core::panicking::panic_bounds_check
10: <rustc::ty::query::on_disk_cache::CacheDecoder<'a, 'tcx, 'x> as serialize::serialize::SpecializedDecoder<syntax_pos::span_encoding::Span>>::specialized_decode
11: serialize::serialize::Decoder::read_struct
12: serialize::serialize::Decoder::read_seq
13: serialize::serialize::Decoder::read_struct
14: serialize::serialize::Decoder::read_seq
15: <rustc::mir::Mir<'tcx> as serialize::serialize::Decodable>::decode::{{closure}}
16: rustc::ty::query::on_disk_cache::OnDiskCache::try_load_query_result
17: <rustc::ty::query::queries::optimized_mir<'tcx> as rustc::ty::query::config::QueryDescription<'tcx>>::try_load_from_disk
18: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
19: rustc_mir::monomorphize::collector::collect_items_rec
20: rustc_mir::monomorphize::collector::collect_items_rec
21: rustc_mir::monomorphize::collector::collect_crate_mono_items::{{closure}}
22: rustc::util::common::time
23: rustc_mir::monomorphize::collector::collect_crate_mono_items
24: rustc::util::common::time
25: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
26: rustc::ty::query::__query_compute::collect_and_partition_mono_items
27: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::collect_and_partition_mono_items<'tcx>>::compute
28: rustc::dep_graph::graph::DepGraph::with_task_impl
29: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
30: rustc_codegen_ssa::base::codegen_crate
31: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_utils::codegen_backend::CodegenBackend>::codegen_crate
32: rustc::util::common::time
33: rustc_driver::driver::phase_4_codegen
34: rustc_driver::driver::compile_input::{{closure}}
35: <std::thread::local::LocalKey<T>>::with
36: rustc::ty::context::TyCtxt::create_and_enter
37: rustc_driver::driver::compile_input
38: rustc_driver::run_compiler_with_pool
39: <scoped_tls::ScopedKey<T>>::set
40: rustc_driver::run_compiler
41: syntax::with_globals
42: __rust_maybe_catch_panic
43: <F as alloc::boxed::FnBox<A>>::call_box
44: std::sys::unix::thread::Thread::new::thread_start
45: _pthread_body
46: _pthread_start
query stack during panic:
#0 [optimized_mir] processing `tests::one_result::{{closure}}`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack