diff options
| -rw-r--r-- | CHANGELOG.md | 1 | ||||
| -rw-r--r-- | clippy_lints/src/functions/mod.rs | 56 | ||||
| -rw-r--r-- | clippy_lints/src/functions/result.rs | 100 | ||||
| -rw-r--r-- | clippy_lints/src/functions/result_unit_err.rs | 66 | ||||
| -rw-r--r-- | clippy_lints/src/lib.register_all.rs | 1 | ||||
| -rw-r--r-- | clippy_lints/src/lib.register_lints.rs | 1 | ||||
| -rw-r--r-- | clippy_lints/src/lib.register_perf.rs | 1 | ||||
| -rw-r--r-- | clippy_lints/src/lib.rs | 2 | ||||
| -rw-r--r-- | clippy_lints/src/utils/conf.rs | 4 | ||||
| -rw-r--r-- | clippy_utils/src/ty.rs | 50 | ||||
| -rw-r--r-- | tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr | 1 | ||||
| -rw-r--r-- | tests/ui/result_large_err.rs | 98 | ||||
| -rw-r--r-- | tests/ui/result_large_err.stderr | 91 |
13 files changed, 401 insertions, 71 deletions
diff --git a/CHANGELOG.md b/CHANGELOG.md index 69ce0a201bf..c488c142e46 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -4025,6 +4025,7 @@ Released 2018-09-13 [`replace_consts`]: https://rust-lang.github.io/rust-clippy/master/index.html#replace_consts [`rest_pat_in_fully_bound_structs`]: https://rust-lang.github.io/rust-clippy/master/index.html#rest_pat_in_fully_bound_structs [`result_expect_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_expect_used +[`result_large_err`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_large_err [`result_map_or_into_option`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_or_into_option [`result_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unit_fn [`result_map_unwrap_or_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unwrap_or_else diff --git a/clippy_lints/src/functions/mod.rs b/clippy_lints/src/functions/mod.rs index 73261fb8a44..90911e0bf25 100644 --- a/clippy_lints/src/functions/mod.rs +++ b/clippy_lints/src/functions/mod.rs @@ -1,6 +1,6 @@ mod must_use; mod not_unsafe_ptr_arg_deref; -mod result_unit_err; +mod result; mod too_many_arguments; mod too_many_lines; @@ -217,17 +217,62 @@ declare_clippy_lint! { "public function returning `Result` with an `Err` type of `()`" } +declare_clippy_lint! { + /// ### What it does + /// Checks for functions that return `Result` with an unusually large + /// `Err`-variant. + /// + /// ### Why is this bad? + /// A `Result` is at least as large as the `Err`-variant. While we + /// expect that variant to be seldomly used, the compiler needs to reserve + /// and move that much memory every single time. + /// + /// ### Known problems + /// The size determined by Clippy is platform-dependent. + /// + /// ### Examples + /// ```rust + /// pub enum ParseError { + /// UnparsedBytes([u8; 512]), + /// UnexpectedEof, + /// } + /// + /// // The `Result` has at least 512 bytes, even in the `Ok`-case + /// pub fn parse() -> Result<(), ParseError> { + /// Ok(()) + /// } + /// ``` + /// should be + /// ``` + /// pub enum ParseError { + /// UnparsedBytes(Box<[u8; 512]>), + /// UnexpectedEof, + /// } + /// + /// // The `Result` is slightly larger than a pointer + /// pub fn parse() -> Result<(), ParseError> { + /// Ok(()) + /// } + /// ``` + #[clippy::version = "1.64.0"] + pub RESULT_LARGE_ERR, + perf, + "function returning `Result` with large `Err` type" +} + #[derive(Copy, Clone)] pub struct Functions { too_many_arguments_threshold: u64, too_many_lines_threshold: u64, + large_error_threshold: u64, } impl Functions { - pub fn new(too_many_arguments_threshold: u64, too_many_lines_threshold: u64) -> Self { + pub fn new(too_many_arguments_threshold: u64, too_many_lines_threshold: u64, large_error_threshold: u64) -> Self { Self { too_many_arguments_threshold, too_many_lines_threshold, + large_error_threshold, } } } @@ -240,6 +285,7 @@ impl_lint_pass!(Functions => [ DOUBLE_MUST_USE, MUST_USE_CANDIDATE, RESULT_UNIT_ERR, + RESULT_LARGE_ERR, ]); impl<'tcx> LateLintPass<'tcx> for Functions { @@ -259,18 +305,18 @@ impl<'tcx> LateLintPass<'tcx> for Functions { fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) { must_use::check_item(cx, item); - result_unit_err::check_item(cx, item); + result::check_item(cx, item, self.large_error_threshold); } fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) { must_use::check_impl_item(cx, item); - result_unit_err::check_impl_item(cx, item); + result::check_impl_item(cx, item, self.large_error_threshold); } fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) { too_many_arguments::check_trait_item(cx, item, self.too_many_arguments_threshold); not_unsafe_ptr_arg_deref::check_trait_item(cx, item); must_use::check_trait_item(cx, item); - result_unit_err::check_trait_item(cx, item); + result::check_trait_item(cx, item, self.large_error_threshold); } } diff --git a/clippy_lints/src/functions/result.rs b/clippy_lints/src/functions/result.rs new file mode 100644 index 00000000000..af520a493ed --- /dev/null +++ b/clippy_lints/src/functions/result.rs @@ -0,0 +1,100 @@ +use rustc_errors::Diagnostic; +use rustc_hir as hir; +use rustc_lint::{LateContext, LintContext}; +use rustc_middle::lint::in_external_macro; +use rustc_middle::ty::{self, Ty}; +use rustc_span::{sym, Span}; +use rustc_typeck::hir_ty_to_ty; + +use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_then}; +use clippy_utils::trait_ref_of_method; +use clippy_utils::ty::{approx_ty_size, is_type_diagnostic_item}; + +use super::{RESULT_LARGE_ERR, RESULT_UNIT_ERR}; + +/// The type of the `Err`-variant in a `std::result::Result` returned by the +/// given `FnDecl` +fn result_err_ty<'tcx>( + cx: &LateContext<'tcx>, + decl: &hir::FnDecl<'tcx>, + item_span: Span, +) -> Option<(&'tcx hir::Ty<'tcx>, Ty<'tcx>)> { + if !in_external_macro(cx.sess(), item_span) + && let hir::FnRetTy::Return(hir_ty) = decl.output + && let ty = hir_ty_to_ty(cx.tcx, hir_ty) + && is_type_diagnostic_item(cx, ty, sym::Result) + && let ty::Adt(_, substs) = ty.kind() + { + let err_ty = substs.type_at(1); + Some((hir_ty, err_ty)) + } else { + None + } +} + +pub(super) fn check_item<'tcx>(cx: &LateContext<'tcx>, item: &hir::Item<'tcx>, large_err_threshold: u64) { + if let hir::ItemKind::Fn(ref sig, _generics, _) = item.kind + && let Some((hir_ty, err_ty)) = result_err_ty(cx, sig.decl, item.span) + { + if cx.access_levels.is_exported(item.def_id) { + let fn_header_span = item.span.with_hi(sig.decl.output.span().hi()); + check_result_unit_err(cx, err_ty, fn_header_span); + } + check_result_large_err(cx, err_ty, hir_ty.span, large_err_threshold); + } +} + +pub(super) fn check_impl_item<'tcx>(cx: &LateContext<'tcx>, item: &hir::ImplItem<'tcx>, large_err_threshold: u64) { + // Don't lint if method is a trait's implementation, we can't do anything about those + if let hir::ImplItemKind::Fn(ref sig, _) = item.kind + && let Some((hir_ty, err_ty)) = result_err_ty(cx, sig.decl, item.span) + && trait_ref_of_method(cx, item.def_id).is_none() + { + if cx.access_levels.is_exported(item.def_id) { + let fn_header_span = item.span.with_hi(sig.decl.output.span().hi()); + check_result_unit_err(cx, err_ty, fn_header_span); + } + check_result_large_err(cx, err_ty, hir_ty.span, large_err_threshold); + } +} + +pub(super) fn check_trait_item<'tcx>(cx: &LateContext<'tcx>, item: &hir::TraitItem<'tcx>, large_err_threshold: u64) { + if let hir::TraitItemKind::Fn(ref sig, _) = item.kind { + let fn_header_span = item.span.with_hi(sig.decl.output.span().hi()); + if let Some((hir_ty, err_ty)) = result_err_ty(cx, sig.decl, item.span) { + if cx.access_levels.is_exported(item.def_id) { + check_result_unit_err(cx, err_ty, fn_header_span); + } + check_result_large_err(cx, err_ty, hir_ty.span, large_err_threshold); + } + } +} + +fn check_result_unit_err(cx: &LateContext<'_>, err_ty: Ty<'_>, fn_header_span: Span) { + if err_ty.is_unit() { + span_lint_and_help( + cx, + RESULT_UNIT_ERR, + fn_header_span, + "this returns a `Result<_, ()>`", + None, + "use a custom `Error` type instead", + ); + } +} + +fn check_result_large_err<'tcx>(cx: &LateContext<'tcx>, err_ty: Ty<'tcx>, hir_ty_span: Span, large_err_threshold: u64) { + let ty_size = approx_ty_size(cx, err_ty); + if ty_size >= large_err_threshold { + span_lint_and_then( + cx, + RESULT_LARGE_ERR, + hir_ty_span, + "the `Err`-variant returned from this function is very large", + |diag: &mut Diagnostic| { + diag.span_label(hir_ty_span, format!("the `Err`-variant is at least {ty_size} bytes")); + diag.help(format!("try reducing the size of `{err_ty}`, for example by boxing large elements or replacing it with `Box<{err_ty}>`")); + }, + ); + } +} diff --git a/clippy_lints/src/functions/result_unit_err.rs b/clippy_lints/src/functions/result_unit_err.rs deleted file mode 100644 index 2e63a1f920d..00000000000 --- a/clippy_lints/src/functions/result_unit_err.rs +++ /dev/null @@ -1,66 +0,0 @@ -use rustc_hir as hir; -use rustc_lint::{LateContext, LintContext}; -use rustc_middle::lint::in_external_macro; -use rustc_middle::ty; -use rustc_span::{sym, Span}; -use rustc_typeck::hir_ty_to_ty; - -use if_chain::if_chain; - -use clippy_utils::diagnostics::span_lint_and_help; -use clippy_utils::trait_ref_of_method; -use clippy_utils::ty::is_type_diagnostic_item; - -use super::RESULT_UNIT_ERR; - -pub(super) fn check_item(cx: &LateContext<'_>, item: &hir::Item<'_>) { - if let hir::ItemKind::Fn(ref sig, _generics, _) = item.kind { - let is_public = cx.access_levels.is_exported(item.def_id); - let fn_header_span = item.span.with_hi(sig.decl.output.span().hi()); - if is_public { - check_result_unit_err(cx, sig.decl, item.span, fn_header_span); - } - } -} - -pub(super) fn check_impl_item(cx: &LateContext<'_>, item: &hir::ImplItem<'_>) { - if let hir::ImplItemKind::Fn(ref sig, _) = item.kind { - let is_public = cx.access_levels.is_exported(item.def_id); - let fn_header_span = item.span.with_hi(sig.decl.output.span().hi()); - if is_public && trait_ref_of_method(cx, item.def_id).is_none() { - check_result_unit_err(cx, sig.decl, item.span, fn_header_span); - } - } -} - -pub(super) fn check_trait_item(cx: &LateContext<'_>, item: &hir::TraitItem<'_>) { - if let hir::TraitItemKind::Fn(ref sig, _) = item.kind { - let is_public = cx.access_levels.is_exported(item.def_id); - let fn_header_span = item.span.with_hi(sig.decl.output.span().hi()); - if is_public { - check_result_unit_err(cx, sig.decl, item.span, fn_header_span); - } - } -} - -fn check_result_unit_err(cx: &LateContext<'_>, decl: &hir::FnDecl<'_>, item_span: Span, fn_header_span: Span) { - if_chain! { - if !in_external_macro(cx.sess(), item_span); - if let hir::FnRetTy::Return(ty) = decl.output; - let ty = hir_ty_to_ty(cx.tcx, ty); - if is_type_diagnostic_item(cx, ty, sym::Result); - if let ty::Adt(_, substs) = ty.kind(); - let err_ty = substs.type_at(1); - if err_ty.is_unit(); - then { - span_lint_and_help( - cx, - RESULT_UNIT_ERR, - fn_header_span, - "this returns a `Result<_, ()>`", - None, - "use a custom `Error` type instead", - ); - } - } -} diff --git a/clippy_lints/src/lib.register_all.rs b/clippy_lints/src/lib.register_all.rs index 700762fa3ef..134cbbf7b5c 100644 --- a/clippy_lints/src/lib.register_all.rs +++ b/clippy_lints/src/lib.register_all.rs @@ -80,6 +80,7 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![ LintId::of(functions::DOUBLE_MUST_USE), LintId::of(functions::MUST_USE_UNIT), LintId::of(functions::NOT_UNSAFE_PTR_ARG_DEREF), + LintId::of(functions::RESULT_LARGE_ERR), LintId::of(functions::RESULT_UNIT_ERR), LintId::of(functions::TOO_MANY_ARGUMENTS), LintId::of(if_let_mutex::IF_LET_MUTEX), diff --git a/clippy_lints/src/lib.register_lints.rs b/clippy_lints/src/lib.register_lints.rs index ee94165d2ed..fd20e016578 100644 --- a/clippy_lints/src/lib.register_lints.rs +++ b/clippy_lints/src/lib.register_lints.rs @@ -171,6 +171,7 @@ store.register_lints(&[ functions::MUST_USE_CANDIDATE, functions::MUST_USE_UNIT, functions::NOT_UNSAFE_PTR_ARG_DEREF, + functions::RESULT_LARGE_ERR, functions::RESULT_UNIT_ERR, functions::TOO_MANY_ARGUMENTS, functions::TOO_MANY_LINES, diff --git a/clippy_lints/src/lib.register_perf.rs b/clippy_lints/src/lib.register_perf.rs index 531fc47f8fa..195ce41e31e 100644 --- a/clippy_lints/src/lib.register_perf.rs +++ b/clippy_lints/src/lib.register_perf.rs @@ -7,6 +7,7 @@ store.register_group(true, "clippy::perf", Some("clippy_perf"), vec![ LintId::of(escape::BOXED_LOCAL), LintId::of(format_args::FORMAT_IN_FORMAT_ARGS), LintId::of(format_args::TO_STRING_IN_FORMAT_ARGS), + LintId::of(functions::RESULT_LARGE_ERR), LintId::of(large_const_arrays::LARGE_CONST_ARRAYS), LintId::of(large_enum_variant::LARGE_ENUM_VARIANT), LintId::of(loops::MANUAL_MEMCPY), diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs index 05d4dbd6859..178e57aaf61 100644 --- a/clippy_lints/src/lib.rs +++ b/clippy_lints/src/lib.rs @@ -668,10 +668,12 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(move || Box::new(disallowed_names::DisallowedNames::new(disallowed_names.clone()))); let too_many_arguments_threshold = conf.too_many_arguments_threshold; let too_many_lines_threshold = conf.too_many_lines_threshold; + let large_error_threshold = conf.large_error_threshold; store.register_late_pass(move || { Box::new(functions::Functions::new( too_many_arguments_threshold, too_many_lines_threshold, + large_error_threshold, )) }); let doc_valid_idents = conf.doc_valid_idents.iter().cloned().collect::<FxHashSet<_>>(); diff --git a/clippy_lints/src/utils/conf.rs b/clippy_lints/src/utils/conf.rs index 47b72f4783e..84e65d5fa0b 100644 --- a/clippy_lints/src/utils/conf.rs +++ b/clippy_lints/src/utils/conf.rs @@ -379,6 +379,10 @@ define_Conf! { /// /// Whether `dbg!` should be allowed in test functions (allow_dbg_in_tests: bool = false), + /// Lint: RESULT_LARGE_ERR + /// + /// The maximum size of the `Err`-variant in a `Result` returned from a function + (large_error_threshold: u64 = 128), } /// Search for the configuration file. diff --git a/clippy_utils/src/ty.rs b/clippy_utils/src/ty.rs index 00182e739b8..5a7f9568441 100644 --- a/clippy_utils/src/ty.rs +++ b/clippy_utils/src/ty.rs @@ -831,3 +831,53 @@ pub fn ty_is_fn_once_param<'tcx>(tcx: TyCtxt<'_>, ty: Ty<'tcx>, predicates: &'tc }) .unwrap_or(false) } + +/// Comes up with an "at least" guesstimate for the type's size, not taking into +/// account the layout of type parameters. +pub fn approx_ty_size<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> u64 { + use rustc_middle::ty::layout::LayoutOf; + if !is_normalizable(cx, cx.param_env, ty) { + return 0; + } + match (cx.layout_of(ty).map(|layout| layout.size.bytes()), ty.kind()) { + (Ok(size), _) => size, + (Err(_), ty::Tuple(list)) => list.as_substs().types().map(|t| approx_ty_size(cx, t)).sum(), + (Err(_), ty::Array(t, n)) => { + n.try_eval_usize(cx.tcx, cx.param_env).unwrap_or_default() * approx_ty_size(cx, *t) + }, + (Err(_), ty::Adt(def, subst)) if def.is_struct() => def + .variants() + .iter() + .map(|v| { + v.fields + .iter() + .map(|field| approx_ty_size(cx, field.ty(cx.tcx, subst))) + .sum::<u64>() + }) + .sum(), + (Err(_), ty::Adt(def, subst)) if def.is_enum() => def + .variants() + .iter() + .map(|v| { + v.fields + .iter() + .map(|field| approx_ty_size(cx, field.ty(cx.tcx, subst))) + .sum::<u64>() + }) + .max() + .unwrap_or_default(), + (Err(_), ty::Adt(def, subst)) if def.is_union() => def + .variants() + .iter() + .map(|v| { + v.fields + .iter() + .map(|field| approx_ty_size(cx, field.ty(cx.tcx, subst))) + .max() + .unwrap_or_default() + }) + .max() + .unwrap_or_default(), + (Err(_), _) => 0, + } +} diff --git a/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr b/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr index 9f8e778b3b9..a52a0b5289f 100644 --- a/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr +++ b/tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr @@ -19,6 +19,7 @@ error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown fie enforced-import-renames enum-variant-name-threshold enum-variant-size-threshold + large-error-threshold literal-representation-threshold max-fn-params-bools max-include-file-size diff --git a/tests/ui/result_large_err.rs b/tests/ui/result_large_err.rs new file mode 100644 index 00000000000..78d8f76fe66 --- /dev/null +++ b/tests/ui/result_large_err.rs @@ -0,0 +1,98 @@ +#![warn(clippy::result_large_err)] + +pub fn small_err() -> Result<(), u128> { + Ok(()) +} + +pub fn large_err() -> Result<(), [u8; 512]> { + Ok(()) +} + +pub struct FullyDefinedLargeError { + _foo: u128, + _bar: [u8; 100], + _foobar: [u8; 120], +} + +impl FullyDefinedLargeError { + pub fn ret() -> Result<(), Self> { + Ok(()) + } +} + +pub fn struct_error() -> Result<(), FullyDefinedLargeError> { + Ok(()) +} + +type Fdlr<T> = std::result::Result<T, FullyDefinedLargeError>; +pub fn large_err_via_type_alias<T>(x: T) -> Fdlr<T> { + Ok(x) +} + +pub fn param_small_error<R>() -> Result<(), (R, u128)> { + Ok(()) +} + +pub fn param_large_error<R>() -> Result<(), (u128, R, FullyDefinedLargeError)> { + Ok(()) +} + +pub enum LargeErrorVariants<T> { + _Small(u8), + _Omg([u8; 512]), + _Param(T), +} + +impl LargeErrorVariants<()> { + pub fn large_enum_error() -> Result<(), Self> { + Ok(()) + } +} + +trait TraitForcesLargeError { + fn large_error() -> Result<(), [u8; 512]> { + Ok(()) + } +} + +struct TraitImpl; + +impl TraitForcesLargeError for TraitImpl { + // Should not lint + fn large_error() -> Result<(), [u8; 512]> { + Ok(()) + } +} + +pub union FullyDefinedUnionError { + _maybe: u8, + _or_even: [[u8; 16]; 32], +} + +pub fn large_union_err() -> Result<(), FullyDefinedUnionError> { + Ok(()) +} + +pub union UnionError<T: Copy> { + _maybe: T, + _or_perhaps_even: (T, [u8; 512]), +} + +pub fn param_large_union<T: Copy>() -> Result<(), UnionError<T>> { + Ok(()) +} + +pub struct ArrayError<T, U> { + _large_array: [T; 32], + _other_stuff: U, +} + +pub fn array_error_subst<U>() -> Result<(), ArrayError<i32, U>> { + Ok(()) +} + +pub fn array_error<T, U>() -> Result<(), ArrayError<(i32, T), U>> { + Ok(()) +} + +fn main() {} diff --git a/tests/ui/result_large_err.stderr b/tests/ui/result_large_err.stderr new file mode 100644 index 00000000000..0f1f39d72cb --- /dev/null +++ b/tests/ui/result_large_err.stderr @@ -0,0 +1,91 @@ +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:7:23 + | +LL | pub fn large_err() -> Result<(), [u8; 512]> { + | ^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 512 bytes + | + = note: `-D clippy::result-large-err` implied by `-D warnings` + = help: try reducing the size of `[u8; 512]`, for example by boxing large elements or replacing it with `Box<[u8; 512]>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:18:21 + | +LL | pub fn ret() -> Result<(), Self> { + | ^^^^^^^^^^^^^^^^ the `Err`-variant is at least 240 bytes + | + = help: try reducing the size of `FullyDefinedLargeError`, for example by boxing large elements or replacing it with `Box<FullyDefinedLargeError>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:23:26 + | +LL | pub fn struct_error() -> Result<(), FullyDefinedLargeError> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 240 bytes + | + = help: try reducing the size of `FullyDefinedLargeError`, for example by boxing large elements or replacing it with `Box<FullyDefinedLargeError>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:28:45 + | +LL | pub fn large_err_via_type_alias<T>(x: T) -> Fdlr<T> { + | ^^^^^^^ the `Err`-variant is at least 240 bytes + | + = help: try reducing the size of `FullyDefinedLargeError`, for example by boxing large elements or replacing it with `Box<FullyDefinedLargeError>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:36:34 + | +LL | pub fn param_large_error<R>() -> Result<(), (u128, R, FullyDefinedLargeError)> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 256 bytes + | + = help: try reducing the size of `(u128, R, FullyDefinedLargeError)`, for example by boxing large elements or replacing it with `Box<(u128, R, FullyDefinedLargeError)>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:47:34 + | +LL | pub fn large_enum_error() -> Result<(), Self> { + | ^^^^^^^^^^^^^^^^ the `Err`-variant is at least 513 bytes + | + = help: try reducing the size of `LargeErrorVariants<()>`, for example by boxing large elements or replacing it with `Box<LargeErrorVariants<()>>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:53:25 + | +LL | fn large_error() -> Result<(), [u8; 512]> { + | ^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 512 bytes + | + = help: try reducing the size of `[u8; 512]`, for example by boxing large elements or replacing it with `Box<[u8; 512]>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:72:29 + | +LL | pub fn large_union_err() -> Result<(), FullyDefinedUnionError> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 512 bytes + | + = help: try reducing the size of `FullyDefinedUnionError`, for example by boxing large elements or replacing it with `Box<FullyDefinedUnionError>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:81:40 + | +LL | pub fn param_large_union<T: Copy>() -> Result<(), UnionError<T>> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 512 bytes + | + = help: try reducing the size of `UnionError<T>`, for example by boxing large elements or replacing it with `Box<UnionError<T>>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:90:34 + | +LL | pub fn array_error_subst<U>() -> Result<(), ArrayError<i32, U>> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 128 bytes + | + = help: try reducing the size of `ArrayError<i32, U>`, for example by boxing large elements or replacing it with `Box<ArrayError<i32, U>>` + +error: the `Err`-variant returned from this function is very large + --> $DIR/result_large_err.rs:94:31 + | +LL | pub fn array_error<T, U>() -> Result<(), ArrayError<(i32, T), U>> { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `Err`-variant is at least 128 bytes + | + = help: try reducing the size of `ArrayError<(i32, T), U>`, for example by boxing large elements or replacing it with `Box<ArrayError<(i32, T), U>>` + +error: aborting due to 11 previous errors + |