Error compiling "guessing_game" tutorial code

[RMBeristain]

Hi, I'm new to Rust and trying to follow the examples.
This was working perfectly fine yesterday.

The only difference is that yesterday I installed the "Rust" extension.
Today VS Code told me that rust wasn't installed in WSL (Ubuntu 20.04) and would I like to install it?

I clicked 'yes' and it did "something" (sorry I didn't pay attention to what happened, I assumed it was updating some internal VS Code stuff). After that I changed a letter on the source code to see the new compile message, as suggested in the Rust book, and it exploded.

I assume this is a VS Code || Rust extension bug but I'm a complete newb and don't know what else to do. Happy to provide more details if needed.

Code

use std::io;

fn main() {
    println!("Guess the number!");
    println!("Please input your guess.");

    let mut guess = String::new();

    io::stdin()
        .read_line(&mut guess)
        .expect("Failed to read the line");

    println!("You guessed: {}", guess);
}

Meta

rustc --version --verbose:

rustc 1.52.0 (88f19c6da 2021-05-03)
binary: rustc
commit-hash: 88f19c6dab716c6281af7602e30f413e809c5974
commit-date: 2021-05-03
host: x86_64-unknown-linux-gnu
release: 1.52.0
LLVM version: 12.0.0

Error output

$ cargo build --verbose
       Fresh cfg-if v1.0.0
       Fresh ppv-lite86 v0.2.10
       Fresh libc v0.2.94
       Fresh getrandom v0.2.2
       Fresh rand_core v0.6.2
       Fresh rand_chacha v0.3.0
       Fresh rand v0.8.3
   Compiling guessing_game v0.1.0 (/home/raider/rust/projects/guessing_game)
     Running `rustc --crate-name guessing_game --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=d237917890a6c67c -C extra-filename=-d237917890a6c67c --out-dir /home/raider/rust/projects/guessing_game/target/debug/deps -C incremental=/home/raider/rust/projects/guessing_game/target/debug/incremental -L dependency=/home/raider/rust/projects/guessing_game/target/debug/deps --extern rand=/home/raider/rust/projects/guessing_game/target/debug/deps/librand-ecf794ab9f75ecae.rlib`
thread 'rustc' panicked at 'found unstable fingerprints for predicates_of(core[b0ed]::fmt::Display): GenericPredicates { parent: None, predicates: [(Binder(TraitPredicate(<Self as std::fmt::Display>)), /home/raider/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:642:1: 642:18 (#0))] }', /rustc/88f19c6dab716c6281af7602e30f413e809c5974/compiler/rustc_query_system/src/query/plumbing.rs:593:5
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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.52.0 (88f19c6da 2021-05-03) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [predicates_of] computing predicates of `std::fmt::Display`
#1 [typeck] type-checking `main`
end of query stack
error: could not compile `guessing_game`

Caused by:
  process didn't exit successfully: `rustc --crate-name guessing_game --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=d237917890a6c67c -C extra-filename=-d237917890a6c67c --out-dir /home/raider/rust/projects/guessing_game/target/debug/deps -C incremental=/home/raider/rust/projects/guessing_game/target/debug/incremental -L dependency=/home/raider/rust/projects/guessing_game/target/debug/deps --extern rand=/home/raider/rust/projects/guessing_game/target/debug/deps/librand-ecf794ab9f75ecae.rlib` (exit code: 101)

Backtrace

$ RUST_BACKTRACE=1 cargo build
   Compiling guessing_game v0.1.0 (/home/raider/rust/projects/guessing_game)
thread 'rustc' panicked at 'found unstable fingerprints for predicates_of(core[b0ed]::fmt::Display): GenericPredicates { parent: None, predicates: [(Binder(TraitPredicate(<Self as std::fmt::Display>)), /home/raider/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:642:1: 642:18 (#0))] }', /rustc/88f19c6dab716c6281af7602e30f413e809c5974/compiler/rustc_query_system/src/query/plumbing.rs:593:5
stack backtrace:
   0: rust_begin_unwind
             at /rustc/88f19c6dab716c6281af7602e30f413e809c5974/library/std/src/panicking.rs:493:5
   1: std::panicking::begin_panic_fmt
             at /rustc/88f19c6dab716c6281af7602e30f413e809c5974/library/std/src/panicking.rs:435:5
   2: rustc_query_system::query::plumbing::incremental_verify_ich
   3: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
   4: rustc_query_system::query::plumbing::get_query_impl
   5: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::predicates_of
   6: rustc_middle::ty::generics::GenericPredicates::instantiate_into
   7: rustc_middle::ty::generics::GenericPredicates::instantiate
   8: rustc_typeck::check::fn_ctxt::_impl::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::instantiate_bounds
   9: rustc_typeck::check::fn_ctxt::_impl::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::add_required_obligations
  10: rustc_typeck::check::fn_ctxt::_impl::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::instantiate_value_path
  11: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  12: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  13: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
  14: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  15: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
  16: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  17: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  18: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  19: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  20: rustc_typeck::check::_match::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_match
  21: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  22: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  23: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  24: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  25: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
  26: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  27: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
  28: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  29: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  30: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_argument_types
  31: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::confirm_builtin_call
  32: rustc_typeck::check::callee::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_call
  33: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_kind
  34: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  35: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
  36: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
  37: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  38: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_stmt
  39: rustc_typeck::check::fn_ctxt::checks::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_block_with_expected
  40: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_with_expectation
  41: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_return_expr
  42: rustc_typeck::check::check::check_fn
  43: rustc_infer::infer::InferCtxtBuilder::enter
  44: rustc_typeck::check::typeck
  45: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  46: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  47: rustc_query_system::query::plumbing::force_query_with_job
  48: rustc_query_system::query::plumbing::get_query_impl
  49: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck
  50: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::par_body_owners
  51: rustc_typeck::check::typeck_item_bodies
  52: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  53: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  54: rustc_data_structures::stack::ensure_sufficient_stack
  55: rustc_query_system::query::plumbing::force_query_with_job
  56: rustc_query_system::query::plumbing::get_query_impl
  57: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::typeck_item_bodies
  58: rustc_session::utils::<impl rustc_session::session::Session>::time
  59: rustc_typeck::check_crate
  60: rustc_interface::passes::analysis
  61: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  62: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  63: rustc_data_structures::stack::ensure_sufficient_stack
  64: rustc_query_system::query::plumbing::force_query_with_job
  65: rustc_query_system::query::plumbing::get_query_impl
  66: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  67: rustc_interface::passes::QueryContext::enter
  68: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  69: rustc_span::with_source_map
  70: rustc_interface::interface::create_compiler_and_run
  71: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose 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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.52.0 (88f19c6da 2021-05-03) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [predicates_of] computing predicates of `std::fmt::Display`
#1 [typeck] type-checking `main`
#2 [typeck_item_bodies] type-checking all item bodies
#3 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `guessing_game`

To learn more, run the command again with --verbose.

[RMBeristain]

I found this after I raised the issue (funny that Google didn't spit it out before 👎 )
#84341

I followed the suggestion to run cargo clean, and then build, and seems fine now?

raider@Ultra:~/rust/projects/guessing_game$ cargo clean
raider@Ultra:~/rust/projects/guessing_game$ cargo build
   Compiling libc v0.2.94
   Compiling getrandom v0.2.2
   Compiling cfg-if v1.0.0
   Compiling ppv-lite86 v0.2.10
   Compiling rand_core v0.6.2
   Compiling rand_chacha v0.3.0
   Compiling rand v0.8.3
   Compiling guessing_game v0.1.0 (/home/raider/rust/projects/guessing_game)
    Finished dev [unoptimized + debuginfo] target(s) in 11.89s

raider@Ultra:~/rust/projects/guessing_game$ cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.06s
     Running `target/debug/guessing_game`
Guess the number!
Please input your guess.
4
You guessed: 4

I would close the issue but I have no clue what happened and don't know if it is helpful, so I'll leave it to you guys to decide.

[jonas-schievink]

You're on an outdated Rust version