diff --git a/Cargo.lock b/Cargo.lock index 13a130a1b49c0..8bd1e5f3308b4 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -3978,7 +3978,6 @@ name = "rustc_middle" version = "0.0.0" dependencies = [ "arena", - "backtrace", "bitflags", "byteorder", "log", diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs index 4a664205bff0b..c0018c613ba5c 100644 --- a/src/bootstrap/builder.rs +++ b/src/bootstrap/builder.rs @@ -1088,13 +1088,13 @@ impl<'a> Builder<'a> { if self.config.deny_warnings { rustflags.arg("-Dwarnings"); + } - // FIXME(#58633) hide "unused attribute" errors in incremental - // builds of the standard library, as the underlying checks are - // not yet properly integrated with incremental recompilation. - if mode == Mode::Std && compiler.stage == 0 && self.config.incremental { - rustflags.arg("-Aunused-attributes"); - } + // FIXME(#58633) hide "unused attribute" errors in incremental + // builds of the standard library, as the underlying checks are + // not yet properly integrated with incremental recompilation. + if mode == Mode::Std && compiler.stage == 0 && self.config.incremental { + rustflags.arg("-Aunused-attributes"); } } diff --git a/src/librustc_middle/Cargo.toml b/src/librustc_middle/Cargo.toml index 8e27e03ea4ffe..398ba4d72d449 100644 --- a/src/librustc_middle/Cargo.toml +++ b/src/librustc_middle/Cargo.toml @@ -30,7 +30,6 @@ rustc_index = { path = "../librustc_index" } rustc_serialize = { path = "../libserialize", package = "serialize" } rustc_ast = { path = "../librustc_ast" } rustc_span = { path = "../librustc_span" } -backtrace = "0.3.40" byteorder = { version = "1.3" } smallvec = { version = "1.0", features = ["union", "may_dangle"] } measureme = "0.7.1" diff --git a/src/librustc_middle/lib.rs b/src/librustc_middle/lib.rs index 4ed03fd21ad18..9b38b43c93ae2 100644 --- a/src/librustc_middle/lib.rs +++ b/src/librustc_middle/lib.rs @@ -23,6 +23,7 @@ //! This API is completely unstable and subject to change. #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")] +#![feature(backtrace)] #![feature(bool_to_option)] #![feature(box_patterns)] #![feature(box_syntax)] diff --git a/src/librustc_middle/mir/interpret/error.rs b/src/librustc_middle/mir/interpret/error.rs index 0ab14b53e1b1f..4b88467ac110f 100644 --- a/src/librustc_middle/mir/interpret/error.rs +++ b/src/librustc_middle/mir/interpret/error.rs @@ -6,7 +6,6 @@ use crate::ty::query::TyCtxtAt; use crate::ty::tls; use crate::ty::{self, layout, Ty}; -use backtrace::Backtrace; use rustc_data_structures::sync::Lock; use rustc_errors::{struct_span_err, DiagnosticBuilder, ErrorReported}; use rustc_hir as hir; @@ -15,7 +14,7 @@ use rustc_macros::HashStable; use rustc_session::CtfeBacktrace; use rustc_span::{def_id::DefId, Pos, Span}; use rustc_target::abi::{Align, Size}; -use std::{any::Any, fmt, mem}; +use std::{any::Any, backtrace::Backtrace, fmt, mem}; #[derive(Debug, Copy, Clone, PartialEq, Eq, HashStable, RustcEncodable, RustcDecodable)] pub enum ErrorHandled { @@ -219,16 +218,15 @@ impl fmt::Display for InterpErrorInfo<'_> { } impl InterpErrorInfo<'_> { - pub fn print_backtrace(&mut self) { - if let Some(ref mut backtrace) = self.backtrace { - print_backtrace(&mut *backtrace); + pub fn print_backtrace(&self) { + if let Some(backtrace) = self.backtrace.as_ref() { + print_backtrace(backtrace); } } } -fn print_backtrace(backtrace: &mut Backtrace) { - backtrace.resolve(); - eprintln!("\n\nAn error occurred in miri:\n{:?}", backtrace); +fn print_backtrace(backtrace: &Backtrace) { + eprintln!("\n\nAn error occurred in miri:\n{}", backtrace); } impl From for InterpErrorInfo<'_> { @@ -255,11 +253,11 @@ impl<'tcx> From> for InterpErrorInfo<'tcx> { let backtrace = match capture_backtrace { CtfeBacktrace::Disabled => None, - CtfeBacktrace::Capture => Some(Box::new(Backtrace::new_unresolved())), + CtfeBacktrace::Capture => Some(Box::new(Backtrace::force_capture())), CtfeBacktrace::Immediate => { // Print it now. - let mut backtrace = Backtrace::new_unresolved(); - print_backtrace(&mut backtrace); + let backtrace = Backtrace::force_capture(); + print_backtrace(&backtrace); None } }; diff --git a/src/librustc_middle/mir/interpret/pointer.rs b/src/librustc_middle/mir/interpret/pointer.rs index 19642278b44e3..0b06005649979 100644 --- a/src/librustc_middle/mir/interpret/pointer.rs +++ b/src/librustc_middle/mir/interpret/pointer.rs @@ -75,18 +75,14 @@ pub trait PointerArithmetic: HasDataLayout { impl PointerArithmetic for T {} -/// `Pointer` is generic over the type that represents a reference to `Allocation`s, -/// thus making it possible for the most convenient representation to be used in -/// each context. +/// Represents a pointer in the Miri engine. /// -/// Defaults to the index based and loosely coupled `AllocId`. -/// -/// `Pointer` is also generic over the `Tag` associated with each pointer, +/// `Pointer` is generic over the `Tag` associated with each pointer, /// which is used to do provenance tracking during execution. #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, RustcEncodable, RustcDecodable, Hash)] #[derive(HashStable)] -pub struct Pointer { - pub alloc_id: Id, +pub struct Pointer { + pub alloc_id: AllocId, pub offset: Size, pub tag: Tag, } @@ -97,7 +93,7 @@ static_assert_size!(Pointer, 16); // all the Miri types. // We have to use `Debug` output for the tag, because `()` does not implement // `Display` so we cannot specialize that. -impl fmt::Debug for Pointer { +impl fmt::Debug for Pointer { default fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { if f.alternate() { write!(f, "{:#?}+0x{:x}[{:?}]", self.alloc_id, self.offset.bytes(), self.tag) @@ -107,7 +103,7 @@ impl fmt::Debug for Pointer { } } // Specialization for no tag -impl fmt::Debug for Pointer<(), Id> { +impl fmt::Debug for Pointer<()> { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { if f.alternate() { write!(f, "{:#?}+0x{:x}", self.alloc_id, self.offset.bytes()) diff --git a/src/librustc_middle/mir/interpret/value.rs b/src/librustc_middle/mir/interpret/value.rs index 0df8a9aa9b040..ed779d52fb50c 100644 --- a/src/librustc_middle/mir/interpret/value.rs +++ b/src/librustc_middle/mir/interpret/value.rs @@ -89,7 +89,7 @@ impl<'tcx> ConstValue<'tcx> { /// of a simple value or a pointer into another `Allocation` #[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd, RustcEncodable, RustcDecodable, Hash)] #[derive(HashStable)] -pub enum Scalar { +pub enum Scalar { /// The raw bytes of a simple value. Raw { /// The first `size` bytes of `data` are the value. @@ -101,7 +101,7 @@ pub enum Scalar { /// A pointer into an `Allocation`. An `Allocation` in the `memory` module has a list of /// relocations, but a `Scalar` is only large enough to contain one, so we just represent the /// relocation and its associated offset together as a `Pointer` here. - Ptr(Pointer), + Ptr(Pointer), } #[cfg(target_arch = "x86_64")] @@ -109,7 +109,7 @@ static_assert_size!(Scalar, 24); // We want the `Debug` output to be readable as it is used by `derive(Debug)` for // all the Miri types. -impl fmt::Debug for Scalar { +impl fmt::Debug for Scalar { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match self { Scalar::Ptr(ptr) => write!(f, "{:?}", ptr), @@ -542,8 +542,8 @@ impl From> for Scalar { } #[derive(Clone, Copy, Eq, PartialEq, RustcEncodable, RustcDecodable, HashStable, Hash)] -pub enum ScalarMaybeUndef { - Scalar(Scalar), +pub enum ScalarMaybeUndef { + Scalar(Scalar), Undef, } @@ -563,7 +563,7 @@ impl From> for ScalarMaybeUndef { // We want the `Debug` output to be readable as it is used by `derive(Debug)` for // all the Miri types. -impl fmt::Debug for ScalarMaybeUndef { +impl fmt::Debug for ScalarMaybeUndef { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { match self { ScalarMaybeUndef::Undef => write!(f, ""), diff --git a/src/librustc_mir/const_eval/error.rs b/src/librustc_mir/const_eval/error.rs index 3c3618f390c61..b165a69433db1 100644 --- a/src/librustc_mir/const_eval/error.rs +++ b/src/librustc_mir/const_eval/error.rs @@ -52,7 +52,7 @@ impl Error for ConstEvalErrKind {} /// Should be called only if the error is actually going to to be reported! pub fn error_to_const_error<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>>( ecx: &InterpCx<'mir, 'tcx, M>, - mut error: InterpErrorInfo<'tcx>, + error: InterpErrorInfo<'tcx>, ) -> ConstEvalErr<'tcx> { error.print_backtrace(); let stacktrace = ecx.generate_stacktrace(); diff --git a/src/librustc_mir/interpret/eval_context.rs b/src/librustc_mir/interpret/eval_context.rs index 82e1984e4623d..f668bafe0803f 100644 --- a/src/librustc_mir/interpret/eval_context.rs +++ b/src/librustc_mir/interpret/eval_context.rs @@ -11,7 +11,7 @@ use rustc_macros::HashStable; use rustc_middle::ich::StableHashingContext; use rustc_middle::mir; use rustc_middle::mir::interpret::{ - sign_extend, truncate, AllocId, FrameInfo, GlobalId, InterpResult, Pointer, Scalar, + sign_extend, truncate, FrameInfo, GlobalId, InterpResult, Pointer, Scalar, }; use rustc_middle::ty::layout::{self, TyAndLayout}; use rustc_middle::ty::{ @@ -103,8 +103,8 @@ pub enum StackPopCleanup { /// State of a local variable including a memoized layout #[derive(Clone, PartialEq, Eq, HashStable)] -pub struct LocalState<'tcx, Tag = (), Id = AllocId> { - pub value: LocalValue, +pub struct LocalState<'tcx, Tag = ()> { + pub value: LocalValue, /// Don't modify if `Some`, this is only used to prevent computing the layout twice #[stable_hasher(ignore)] pub layout: Cell>>, @@ -112,7 +112,7 @@ pub struct LocalState<'tcx, Tag = (), Id = AllocId> { /// Current value of a local variable #[derive(Copy, Clone, PartialEq, Eq, Debug, HashStable)] // Miri debug-prints these -pub enum LocalValue { +pub enum LocalValue { /// This local is not currently alive, and cannot be used at all. Dead, /// This local is alive but not yet initialized. It can be written to @@ -125,7 +125,7 @@ pub enum LocalValue { /// This is an optimization over just always having a pointer here; /// we can thus avoid doing an allocation when the local just stores /// immediate values *and* never has its address taken. - Live(Operand), + Live(Operand), } impl<'tcx, Tag: Copy + 'static> LocalState<'tcx, Tag> { diff --git a/src/librustc_mir/interpret/operand.rs b/src/librustc_mir/interpret/operand.rs index b924f20ce7cc8..e2fb9de486f09 100644 --- a/src/librustc_mir/interpret/operand.rs +++ b/src/librustc_mir/interpret/operand.rs @@ -15,8 +15,8 @@ use rustc_target::abi::{Abi, DiscriminantKind, HasDataLayout, Integer, LayoutOf, use rustc_target::abi::{VariantIdx, Variants}; use super::{ - from_known_layout, sign_extend, truncate, AllocId, ConstValue, GlobalId, InterpCx, - InterpResult, MPlaceTy, Machine, MemPlace, Place, PlaceTy, Pointer, Scalar, ScalarMaybeUndef, + from_known_layout, sign_extend, truncate, ConstValue, GlobalId, InterpCx, InterpResult, + MPlaceTy, Machine, MemPlace, Place, PlaceTy, Pointer, Scalar, ScalarMaybeUndef, }; /// An `Immediate` represents a single immediate self-contained Rust value. @@ -27,9 +27,9 @@ use super::{ /// In particular, thanks to `ScalarPair`, arithmetic operations and casts can be entirely /// defined on `Immediate`, and do not have to work with a `Place`. #[derive(Copy, Clone, Debug, PartialEq, Eq, HashStable, Hash)] -pub enum Immediate { - Scalar(ScalarMaybeUndef), - ScalarPair(ScalarMaybeUndef, ScalarMaybeUndef), +pub enum Immediate { + Scalar(ScalarMaybeUndef), + ScalarPair(ScalarMaybeUndef, ScalarMaybeUndef), } impl From> for Immediate { @@ -145,9 +145,9 @@ impl<'tcx, Tag> ::std::ops::Deref for ImmTy<'tcx, Tag> { /// or still in memory. The latter is an optimization, to delay reading that chunk of /// memory and to avoid having to store arbitrary-sized data here. #[derive(Copy, Clone, Debug, PartialEq, Eq, HashStable, Hash)] -pub enum Operand { - Immediate(Immediate), - Indirect(MemPlace), +pub enum Operand { + Immediate(Immediate), + Indirect(MemPlace), } #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)] diff --git a/src/librustc_mir/interpret/place.rs b/src/librustc_mir/interpret/place.rs index ba17a0b482afc..fee9ca0c02e39 100644 --- a/src/librustc_mir/interpret/place.rs +++ b/src/librustc_mir/interpret/place.rs @@ -20,9 +20,9 @@ use super::{ #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable)] /// Information required for the sound usage of a `MemPlace`. -pub enum MemPlaceMeta { +pub enum MemPlaceMeta { /// The unsized payload (e.g. length for slices or vtable pointer for trait objects). - Meta(Scalar), + Meta(Scalar), /// `Sized` types or unsized `extern type` None, /// The address of this place may not be taken. This protects the `MemPlace` from coming from @@ -32,8 +32,8 @@ pub enum MemPlaceMeta { Poison, } -impl MemPlaceMeta { - pub fn unwrap_meta(self) -> Scalar { +impl MemPlaceMeta { + pub fn unwrap_meta(self) -> Scalar { match self { Self::Meta(s) => s, Self::None | Self::Poison => { @@ -47,9 +47,7 @@ impl MemPlaceMeta { Self::None | Self::Poison => false, } } -} -impl MemPlaceMeta { pub fn erase_tag(self) -> MemPlaceMeta<()> { match self { Self::Meta(s) => MemPlaceMeta::Meta(s.erase_tag()), @@ -60,22 +58,22 @@ impl MemPlaceMeta { } #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable)] -pub struct MemPlace { +pub struct MemPlace { /// A place may have an integral pointer for ZSTs, and since it might /// be turned back into a reference before ever being dereferenced. /// However, it may never be undef. - pub ptr: Scalar, + pub ptr: Scalar, pub align: Align, /// Metadata for unsized places. Interpretation is up to the type. /// Must not be present for sized types, but can be missing for unsized types /// (e.g., `extern type`). - pub meta: MemPlaceMeta, + pub meta: MemPlaceMeta, } #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable)] -pub enum Place { +pub enum Place { /// A place referring to a value allocated in the `Memory` system. - Ptr(MemPlace), + Ptr(MemPlace), /// To support alloc-free locals, we are able to write directly to a local. /// (Without that optimization, we'd just always be a `MemPlace`.) diff --git a/src/librustc_trait_selection/traits/util.rs b/src/librustc_trait_selection/traits/util.rs index 4aceccf64ce65..eff73cf4a2d8a 100644 --- a/src/librustc_trait_selection/traits/util.rs +++ b/src/librustc_trait_selection/traits/util.rs @@ -217,7 +217,6 @@ pub fn impl_trait_ref_and_oblig<'a, 'tcx>( (impl_trait_ref, impl_obligations) } -/// See [`super::obligations_for_generics`]. pub fn predicates_for_generics<'tcx>( cause: ObligationCause<'tcx>, recursion_depth: usize, diff --git a/src/test/ui/non-ice-error-on-worker-io-fail.rs b/src/test/ui/non-ice-error-on-worker-io-fail.rs index 8af17742850da..30779fc65c0fd 100644 --- a/src/test/ui/non-ice-error-on-worker-io-fail.rs +++ b/src/test/ui/non-ice-error-on-worker-io-fail.rs @@ -4,8 +4,12 @@ // // An attempt to `-o` into a directory we cannot write into should indeed // be an error; but not an ICE. +// +// However, some folks run tests as root, which can write `/dev/` and end +// up clobbering `/dev/null`. Instead we'll use a non-existent path, which +// also used to ICE, but even root can't magically write there. -// compile-flags: -o /dev/null +// compile-flags: -o /does-not-exist/output // The error-pattern check occurs *before* normalization, and the error patterns // are wildly different between build environments. So this is a cop-out (and we @@ -15,10 +19,10 @@ // error-pattern: error // On Mac OS X, we get an error like the below -// normalize-stderr-test "failed to write bytecode to /dev/null.non_ice_error_on_worker_io_fail.*" -> "io error modifying /dev/" +// normalize-stderr-test "failed to write bytecode to /does-not-exist/output.non_ice_error_on_worker_io_fail.*" -> "io error modifying /does-not-exist/" // On Linux, we get an error like the below -// normalize-stderr-test "couldn't create a temp dir.*" -> "io error modifying /dev/" +// normalize-stderr-test "couldn't create a temp dir.*" -> "io error modifying /does-not-exist/" // ignore-tidy-linelength // ignore-windows - this is a unix-specific test diff --git a/src/test/ui/non-ice-error-on-worker-io-fail.stderr b/src/test/ui/non-ice-error-on-worker-io-fail.stderr index f732abc52b712..edadecf273a7b 100644 --- a/src/test/ui/non-ice-error-on-worker-io-fail.stderr +++ b/src/test/ui/non-ice-error-on-worker-io-fail.stderr @@ -1,6 +1,6 @@ warning: ignoring --out-dir flag due to -o flag -error: io error modifying /dev/ +error: io error modifying /does-not-exist/ error: aborting due to previous error; 1 warning emitted diff --git a/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.rs b/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.rs index 0a1686eac9d34..5dee0f5dae0b0 100644 --- a/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.rs +++ b/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.rs @@ -11,19 +11,26 @@ fn foo + Send + 'static>(x: F) -> BoxFuture<'static, i32> x //~ ERROR mismatched types } -// FIXME: uncomment these once this commit is in Beta and we can rely on `rustc_on_unimplemented` -// having filtering for `Self` being a trait. -// -// fn bar + Send + 'static>(x: F) -> BoxFuture<'static, i32> { -// Box::new(x) -// } -// -// fn baz + Send + 'static>(x: F) -> BoxFuture<'static, i32> { -// Pin::new(x) -// } -// -// fn qux + Send + 'static>(x: F) -> BoxFuture<'static, i32> { -// Pin::new(Box::new(x)) -// } +// This case is still subpar: +// `Pin::new(x)`: store this in the heap by calling `Box::new`: `Box::new(x)` +// Should suggest changing the code from `Pin::new` to `Box::pin`. +fn bar + Send + 'static>(x: F) -> BoxFuture<'static, i32> { + Box::new(x) //~ ERROR mismatched types +} + +fn baz + Send + 'static>(x: F) -> BoxFuture<'static, i32> { + Pin::new(x) //~ ERROR mismatched types + //~^ ERROR E0277 +} + +fn qux + Send + 'static>(x: F) -> BoxFuture<'static, i32> { + Pin::new(Box::new(x)) //~ ERROR E0277 +} + +fn zap() -> BoxFuture<'static, i32> { + async { //~ ERROR mismatched types + 42 + } +} fn main() {} diff --git a/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.stderr b/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.stderr index 48d941283b62d..ff256eb30947a 100644 --- a/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.stderr +++ b/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.stderr @@ -15,6 +15,78 @@ LL | x = help: type parameters must be constrained to match other types = note: for more information, visit https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters -error: aborting due to previous error +error[E0308]: mismatched types + --> $DIR/expected-boxed-future-isnt-pinned.rs:18:5 + | +LL | fn bar + Send + 'static>(x: F) -> BoxFuture<'static, i32> { + | ----------------------- expected `std::pin::Pin + std::marker::Send + 'static)>>` because of return type +LL | Box::new(x) + | ^^^^^^^^^^^ expected struct `std::pin::Pin`, found struct `std::boxed::Box` + | + = note: expected struct `std::pin::Pin + std::marker::Send + 'static)>>` + found struct `std::boxed::Box` + = help: use `Box::pin` + +error[E0308]: mismatched types + --> $DIR/expected-boxed-future-isnt-pinned.rs:22:14 + | +LL | fn baz + Send + 'static>(x: F) -> BoxFuture<'static, i32> { + | - this type parameter +LL | Pin::new(x) + | ^ + | | + | expected struct `std::boxed::Box`, found type parameter `F` + | help: store this in the heap by calling `Box::new`: `Box::new(x)` + | + = note: expected struct `std::boxed::Box + std::marker::Send>` + found type parameter `F` + = help: type parameters must be constrained to match other types + = note: for more information, visit https://doc.rust-lang.org/book/ch10-02-traits.html#traits-as-parameters + = note: for more on the distinction between the stack and the heap, read https://doc.rust-lang.org/book/ch15-01-box.html, https://doc.rust-lang.org/rust-by-example/std/box.html, and https://doc.rust-lang.org/std/boxed/index.html + +error[E0277]: `dyn std::future::Future + std::marker::Send` cannot be unpinned + --> $DIR/expected-boxed-future-isnt-pinned.rs:22:5 + | +LL | Pin::new(x) + | ^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `dyn std::future::Future + std::marker::Send` + | + = note: consider using `Box::pin` + = note: required by `std::pin::Pin::

::new` + +error[E0277]: `dyn std::future::Future + std::marker::Send` cannot be unpinned + --> $DIR/expected-boxed-future-isnt-pinned.rs:27:5 + | +LL | Pin::new(Box::new(x)) + | ^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `dyn std::future::Future + std::marker::Send` + | + = note: consider using `Box::pin` + = note: required by `std::pin::Pin::

::new` + +error[E0308]: mismatched types + --> $DIR/expected-boxed-future-isnt-pinned.rs:31:5 + | +LL | fn zap() -> BoxFuture<'static, i32> { + | ----------------------- expected `std::pin::Pin + std::marker::Send + 'static)>>` because of return type +LL | / async { +LL | | 42 +LL | | } + | |_____^ expected struct `std::pin::Pin`, found opaque type + | + ::: $SRC_DIR/libcore/future/mod.rs:LL:COL + | +LL | pub const fn from_generator(gen: T) -> impl Future + | ------------------------------- the found opaque type + | + = note: expected struct `std::pin::Pin + std::marker::Send + 'static)>>` + found opaque type `impl std::future::Future` +help: you need to pin and box this expression + | +LL | Box::pin(async { +LL | 42 +LL | }) + | + +error: aborting due to 6 previous errors -For more information about this error, try `rustc --explain E0308`. +Some errors have detailed explanations: E0277, E0308. +For more information about an error, try `rustc --explain E0277`.