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
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:
Changing the
contentsstring literal to be formatted in the conventional way, i.e. without the manually inserted newline characters makes the code compile again (see below).Meta
The complete error message
The backtrace: