Closed
Description
Code
fn sof<T>() -> T {}
fn test<T>() {
let _: [u8; sof::<T>()];
}Meta
rustc --version --verbose:
rustc 1.49.0-nightly (adef9da30 2020-10-13)
binary: rustc
commit-hash: adef9da30f1ecbfeb81312d01ed94ac53f7161ba
commit-date: 2020-10-13
host: x86_64-unknown-linux-gnu
release: 1.49.0-nightly
LLVM version: 11.0
Error output
error[E0601]: `main` function not found in crate `reduced_mutant`
--> reduced_mutant.rs:1:1
|
1 | / fn sof<T>() -> T {}
2 | | fn test<T>() {
3 | | let _: [u8; sof::<T>()];
4 | | }
| |_^ consider adding a `main` function to `reduced_mutant.rs`
error[E0308]: mismatched types
--> reduced_mutant.rs:1:16
|
1 | fn sof<T>() -> T {}
| --- - ^ expected type parameter `T`, found `()`
| | |
| | this type parameter
| implicitly returns `()` as its body has no tail or `return` expression
|
= note: expected type parameter `T`
found unit type `()`
error[E0277]: the size for values of type `T` cannot be known at compilation time
--> reduced_mutant.rs:3:23
|
1 | fn sof<T>() -> T {}
| - required by this bound in `sof`
2 | fn test<T>() {
| - this type parameter needs to be `Sized`
3 | let _: [u8; sof::<T>()];
| ^ doesn't have a size known at compile-time
|
help: consider relaxing the implicit `Sized` restriction
|
1 | fn sof<T: ?Sized>() -> T {}
| ^^^^^^^^
thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', compiler/rustc_middle/src/ty/mod.rs:893:14
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 1.49.0-nightly (dd7fc54eb 2020-10-15) running on x86_64-unknown-linux-gnu
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0277, E0308, E0601.
For more information about an error, try `rustc --explain E0277`.
Backtrace
thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', compiler/rustc_middle/src/ty/mod.rs:893:14
stack backtrace:
0: rust_begin_unwind
at /rustc/dd7fc54ebdca419ad9d3ab1e9f5ed14e770768ea/library/std/src/panicking.rs:483:5
1: core::panicking::panic_fmt
at /rustc/dd7fc54ebdca419ad9d3ab1e9f5ed14e770768ea/library/core/src/panicking.rs:85:14
2: core::panicking::panic_bounds_check
at /rustc/dd7fc54ebdca419ad9d3ab1e9f5ed14e770768ea/library/core/src/panicking.rs:62:5
3: rustc_middle::ty::Generics::param_at
4: rustc_middle::ty::error::<impl rustc_middle::ty::context::TyCtxt>::note_and_explain_type_err
5: rustc_infer::infer::error_reporting::<impl rustc_infer::infer::InferCtxt>::note_type_err
6: rustc_infer::infer::error_reporting::<impl rustc_infer::infer::InferCtxt>::report_and_explain_type_error
7: rustc_infer::infer::InferCtxt::report_mismatched_types
8: rustc_typeck::check::demand::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::demand_coerce_diag
9: rustc_typeck::check::expr::<impl rustc_typeck::check::fn_ctxt::FnCtxt>::check_expr_coercable_to_type
10: rustc_infer::infer::InferCtxtBuilder::enter
11: rustc_typeck::check::typeck
12: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
13: rustc_data_structures::stack::ensure_sufficient_stack
14: rustc_query_system::query::plumbing::get_query_impl
15: rustc_middle::ty::context::TyCtxt::typeck_opt_const_arg
16: rustc_mir::const_eval::eval_queries::eval_to_allocation_raw_provider
17: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_allocation_raw>::compute
18: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
19: rustc_data_structures::stack::ensure_sufficient_stack
20: rustc_query_system::query::plumbing::get_query_impl
21: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
22: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
23: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
24: rustc_data_structures::stack::ensure_sufficient_stack
25: rustc_query_system::query::plumbing::get_query_impl
26: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
27: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
28: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
29: rustc_data_structures::stack::ensure_sufficient_stack
30: rustc_query_system::query::plumbing::get_query_impl
31: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id
32: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_resolve
33: <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_const
34: rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::TyS>::super_fold_with
35: <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_ty
36: rustc_data_structures::stack::ensure_sufficient_stack
37: rustc_trait_selection::traits::project::normalize
38: <rustc_infer::infer::InferCtxt as rustc_trait_selection::infer::InferCtxtExt>::partially_normalize_associated_types_in
39: rustc_typeck::check::inherited::Inherited::normalize_associated_types_in
40: <rustc_typeck::check::fn_ctxt::FnCtxt as rustc_typeck::astconv::AstConv>::normalize_ty
41: <dyn rustc_typeck::astconv::AstConv>::ast_ty_to_ty_inner
42: <rustc_typeck::check::gather_locals::GatherLocalsVisitor as rustc_hir::intravisit::Visitor>::visit_local
43: rustc_hir::intravisit::walk_expr
44: rustc_typeck::check::check::check_fn
45: rustc_infer::infer::InferCtxtBuilder::enter
46: rustc_typeck::check::typeck
47: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck>::compute
48: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
49: rustc_data_structures::stack::ensure_sufficient_stack
50: rustc_query_system::query::plumbing::get_query_impl
51: rustc_query_system::query::plumbing::ensure_query_impl
52: rustc_typeck::check::typeck_item_bodies
53: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck_item_bodies>::compute
54: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
55: rustc_data_structures::stack::ensure_sufficient_stack
56: rustc_query_system::query::plumbing::get_query_impl
57: rustc_typeck::check_crate
58: rustc_interface::passes::analysis
59: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
60: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
61: rustc_data_structures::stack::ensure_sufficient_stack
62: rustc_query_system::query::plumbing::get_query_impl
63: rustc_interface::passes::QueryContext::enter
64: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
65: rustc_span::with_source_map
66: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.