diff --git a/src/tools/rust-analyzer/crates/base-db/src/lib.rs b/src/tools/rust-analyzer/crates/base-db/src/lib.rs
index f5165ea8a7bb..96fbbc317d48 100644
--- a/src/tools/rust-analyzer/crates/base-db/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/base-db/src/lib.rs
@@ -1,7 +1,5 @@
 //! base_db defines basic database traits. The concrete DB is defined by ide.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod change;
 mod input;
 
diff --git a/src/tools/rust-analyzer/crates/cfg/src/lib.rs b/src/tools/rust-analyzer/crates/cfg/src/lib.rs
index 9a365889e6a4..8b30286a0a8a 100644
--- a/src/tools/rust-analyzer/crates/cfg/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/cfg/src/lib.rs
@@ -1,7 +1,5 @@
 //! cfg defines conditional compiling options, `cfg` attribute parser and evaluator
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod cfg_expr;
 mod dnf;
 #[cfg(test)]
diff --git a/src/tools/rust-analyzer/crates/flycheck/src/lib.rs b/src/tools/rust-analyzer/crates/flycheck/src/lib.rs
index 4584400e66f0..a257633516ce 100644
--- a/src/tools/rust-analyzer/crates/flycheck/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/flycheck/src/lib.rs
@@ -6,8 +6,6 @@
 // addition to `cargo check`. Either split it into 3 crates (one for test, one for check
 // and one common utilities) or change its name and docs to reflect the current state.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 use std::{fmt, io, process::Command, time::Duration};
 
 use crossbeam_channel::{never, select, unbounded, Receiver, Sender};
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/lib.rs b/src/tools/rust-analyzer/crates/hir-def/src/lib.rs
index 3fa98efbb5ea..211cdd35fd73 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/lib.rs
@@ -7,7 +7,6 @@
 //! Note that `hir_def` is a work in progress, so not all of the above is
 //! actually true.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 
 #[cfg(feature = "in-rust-tree")]
diff --git a/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs b/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs
index a7150cf30874..e7c34e51e857 100644
--- a/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/hir-expand/src/lib.rs
@@ -4,7 +4,6 @@
 //! tree originates not from the text of some `FileId`, but from some macro
 //! expansion.
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
-#![warn(rust_2018_idioms, unused_lifetimes)]
 
 pub mod attrs;
 pub mod builtin_attr_macro;
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/lib.rs b/src/tools/rust-analyzer/crates/hir-ty/src/lib.rs
index 07c0cf920f74..bd650869bb38 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/lib.rs
@@ -1,6 +1,6 @@
 //! The type system. We currently use this to infer types for completion, hover
 //! information and various assists.
-#![warn(rust_2018_idioms, unused_lifetimes)]
+
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 
 #[cfg(feature = "in-rust-tree")]
diff --git a/src/tools/rust-analyzer/crates/hir/src/lib.rs b/src/tools/rust-analyzer/crates/hir/src/lib.rs
index eea25ac18ae9..a9ae8d564902 100644
--- a/src/tools/rust-analyzer/crates/hir/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/hir/src/lib.rs
@@ -17,7 +17,6 @@
 //! from the ide with completions, hovers, etc. It is a (soft, internal) boundary:
 //! <https://www.tedinski.com/2018/02/06/system-boundaries.html>.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 #![recursion_limit = "512"]
 
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/lib.rs b/src/tools/rust-analyzer/crates/ide-assists/src/lib.rs
index abebdec1d18c..685d230dc6f9 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/lib.rs
@@ -58,8 +58,6 @@
 //! See also this post:
 //! <https://rust-analyzer.github.io/blog/2020/09/28/how-to-make-a-light-bulb.html>
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod assist_config;
 mod assist_context;
 #[cfg(test)]
diff --git a/src/tools/rust-analyzer/crates/ide-completion/src/lib.rs b/src/tools/rust-analyzer/crates/ide-completion/src/lib.rs
index 8323b8f9331d..7150fe3f0176 100644
--- a/src/tools/rust-analyzer/crates/ide-completion/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide-completion/src/lib.rs
@@ -1,7 +1,5 @@
 //! `completions` crate provides utilities for generating completions of user input.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod completions;
 mod config;
 mod context;
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/lib.rs b/src/tools/rust-analyzer/crates/ide-db/src/lib.rs
index 357209ceb0b4..8fac5baa57b6 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/lib.rs
@@ -2,8 +2,6 @@
 //!
 //! It is mainly a `HirDatabase` for semantic analysis, plus a `SymbolsDatabase`, for fuzzy search.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod apply_change;
 
 pub mod active_parameter;
diff --git a/src/tools/rust-analyzer/crates/ide-diagnostics/src/lib.rs b/src/tools/rust-analyzer/crates/ide-diagnostics/src/lib.rs
index a419f04bfae6..c696faf270dd 100644
--- a/src/tools/rust-analyzer/crates/ide-diagnostics/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide-diagnostics/src/lib.rs
@@ -23,8 +23,6 @@
 //! There are also a couple of ad-hoc diagnostics implemented directly here, we
 //! don't yet have a great pattern for how to do them properly.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod handlers {
     pub(crate) mod break_outside_of_loop;
     pub(crate) mod expected_function;
diff --git a/src/tools/rust-analyzer/crates/ide-ssr/src/lib.rs b/src/tools/rust-analyzer/crates/ide-ssr/src/lib.rs
index b5bf510aeed4..407433ed1923 100644
--- a/src/tools/rust-analyzer/crates/ide-ssr/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide-ssr/src/lib.rs
@@ -3,8 +3,6 @@
 //! Allows searching the AST for code that matches one or more patterns and then replacing that code
 //! based on a template.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 // Feature: Structural Search and Replace
 //
 // Search and replace with named wildcards that will match any expression, type, path, pattern or item.
diff --git a/src/tools/rust-analyzer/crates/ide/src/lib.rs b/src/tools/rust-analyzer/crates/ide/src/lib.rs
index a2ac62341df9..28ae0dce9878 100644
--- a/src/tools/rust-analyzer/crates/ide/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/lib.rs
@@ -8,7 +8,7 @@
 //! in this crate.
 
 // For proving that RootDatabase is RefUnwindSafe.
-#![warn(rust_2018_idioms, unused_lifetimes)]
+
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 #![recursion_limit = "128"]
 
diff --git a/src/tools/rust-analyzer/crates/limit/src/lib.rs b/src/tools/rust-analyzer/crates/limit/src/lib.rs
index 27471db6a341..c1caeed2f872 100644
--- a/src/tools/rust-analyzer/crates/limit/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/limit/src/lib.rs
@@ -1,7 +1,5 @@
 //! limit defines a struct to enforce limits.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 #[cfg(feature = "tracking")]
 use std::sync::atomic::AtomicUsize;
 
diff --git a/src/tools/rust-analyzer/crates/mbe/src/lib.rs b/src/tools/rust-analyzer/crates/mbe/src/lib.rs
index 5f0598dfe072..b2fd91f6ced7 100644
--- a/src/tools/rust-analyzer/crates/mbe/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/mbe/src/lib.rs
@@ -6,8 +6,6 @@
 //! The tests for this functionality live in another crate:
 //! `hir_def::macro_expansion_tests::mbe`.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod expander;
 mod parser;
 mod syntax_bridge;
diff --git a/src/tools/rust-analyzer/crates/parser/src/lib.rs b/src/tools/rust-analyzer/crates/parser/src/lib.rs
index c2f9ea477286..738ed239a7c9 100644
--- a/src/tools/rust-analyzer/crates/parser/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/parser/src/lib.rs
@@ -17,7 +17,6 @@
 //!
 //! [`Parser`]: crate::parser::Parser
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
 #![allow(rustdoc::private_intra_doc_links)]
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 
diff --git a/src/tools/rust-analyzer/crates/paths/src/lib.rs b/src/tools/rust-analyzer/crates/paths/src/lib.rs
index 33c3f83db50f..885f071889ec 100644
--- a/src/tools/rust-analyzer/crates/paths/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/paths/src/lib.rs
@@ -1,8 +1,6 @@
 //! Thin wrappers around `std::path`/`camino::path`, distinguishing between absolute and
 //! relative paths.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 use std::{
     borrow::Borrow,
     ffi::OsStr,
diff --git a/src/tools/rust-analyzer/crates/proc-macro-api/src/lib.rs b/src/tools/rust-analyzer/crates/proc-macro-api/src/lib.rs
index c64ec77487d9..039509d87c25 100644
--- a/src/tools/rust-analyzer/crates/proc-macro-api/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/proc-macro-api/src/lib.rs
@@ -5,8 +5,6 @@
 //! is used to provide basic infrastructure for communication between two
 //! processes: Client (RA itself), Server (the external program)
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 pub mod msg;
 mod process;
 
diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/imp/src/lib.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/imp/src/lib.rs
index 5f8530d08c43..a1707364f3c2 100644
--- a/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/imp/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/imp/src/lib.rs
@@ -1,6 +1,6 @@
 //! Exports a few trivial procedural macros for testing.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
+
 #![feature(proc_macro_span, proc_macro_def_site)]
 #![allow(clippy::all)]
 
diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/src/lib.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/src/lib.rs
index 739c6ec6f449..2edf23a63440 100644
--- a/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/src/lib.rs
@@ -1,6 +1,4 @@
 //! Exports a few trivial procedural macros for testing.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 pub static PROC_MACRO_TEST_LOCATION: &str =
     include_str!(concat!(env!("OUT_DIR"), "/proc_macro_test_location.txt"));
diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/src/lib.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/src/lib.rs
index 2472c1e3119c..b86dceeb5034 100644
--- a/src/tools/rust-analyzer/crates/proc-macro-srv/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv/src/lib.rs
@@ -13,7 +13,6 @@
 #![cfg(any(feature = "sysroot-abi", rust_analyzer))]
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 #![feature(proc_macro_internals, proc_macro_diagnostic, proc_macro_span)]
-#![warn(rust_2018_idioms, unused_lifetimes)]
 #![allow(unreachable_pub, internal_features)]
 
 extern crate proc_macro;
diff --git a/src/tools/rust-analyzer/crates/profile/src/lib.rs b/src/tools/rust-analyzer/crates/profile/src/lib.rs
index 2ccb1cd06ae4..c1ae0d43d072 100644
--- a/src/tools/rust-analyzer/crates/profile/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/profile/src/lib.rs
@@ -1,7 +1,5 @@
 //! A collection of tools for profiling rust-analyzer.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 #[cfg(feature = "cpu_profiler")]
 mod google_cpu_profiler;
 mod memory_usage;
diff --git a/src/tools/rust-analyzer/crates/project-model/src/lib.rs b/src/tools/rust-analyzer/crates/project-model/src/lib.rs
index 35643dcc0284..92bf6a08f870 100644
--- a/src/tools/rust-analyzer/crates/project-model/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/project-model/src/lib.rs
@@ -15,8 +15,6 @@
 //!   procedural macros).
 //! * Lowering of concrete model to a [`base_db::CrateGraph`]
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod build_scripts;
 mod cargo_workspace;
 mod cfg;
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/bin/main.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/bin/main.rs
index 774784f37b00..1985093bc5c3 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/bin/main.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/bin/main.rs
@@ -2,7 +2,6 @@
 //!
 //! Based on cli flags, either spawns an LSP server, or runs a batch analysis
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
 #![allow(clippy::print_stdout, clippy::print_stderr)]
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
 
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/lib.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/lib.rs
index a398e98f093b..a8e6657c24c5 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/lib.rs
@@ -9,8 +9,6 @@
 //! The `cli` submodule implements some batch-processing analysis, primarily as
 //! a debugging aid.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 pub mod cli;
 
 mod caps;
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/tests/slow-tests/main.rs b/src/tools/rust-analyzer/crates/rust-analyzer/tests/slow-tests/main.rs
index f886df60e681..51b3076b4632 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/tests/slow-tests/main.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/tests/slow-tests/main.rs
@@ -8,7 +8,6 @@
 //! specific JSON shapes here -- there's little value in such tests, as we can't
 //! be sure without a real client anyway.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
 #![allow(clippy::disallowed_types)]
 
 mod ratoml;
diff --git a/src/tools/rust-analyzer/crates/sourcegen/src/lib.rs b/src/tools/rust-analyzer/crates/sourcegen/src/lib.rs
index 829b4d5b0ff2..307c214c61d5 100644
--- a/src/tools/rust-analyzer/crates/sourcegen/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/sourcegen/src/lib.rs
@@ -6,8 +6,6 @@
 //!
 //! This crate contains utilities to make this kind of source-gen easy.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 use std::{
     fmt, fs, mem,
     path::{Path, PathBuf},
diff --git a/src/tools/rust-analyzer/crates/stdx/src/lib.rs b/src/tools/rust-analyzer/crates/stdx/src/lib.rs
index 54f10df42a85..76dbd42ff6b2 100644
--- a/src/tools/rust-analyzer/crates/stdx/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/stdx/src/lib.rs
@@ -1,7 +1,5 @@
 //! Missing batteries for standard libraries.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 use std::io as sio;
 use std::process::Command;
 use std::{cmp::Ordering, ops, time::Instant};
diff --git a/src/tools/rust-analyzer/crates/syntax/src/lib.rs b/src/tools/rust-analyzer/crates/syntax/src/lib.rs
index b5d816b0ce1a..177f48b986a9 100644
--- a/src/tools/rust-analyzer/crates/syntax/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/syntax/src/lib.rs
@@ -20,7 +20,6 @@
 //! [Swift]: <https://github.com/apple/swift/blob/13d593df6f359d0cb2fc81cfaac273297c539455/lib/Syntax/README.md>
 
 #![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
-#![warn(rust_2018_idioms, unused_lifetimes)]
 
 #[cfg(not(feature = "in-rust-tree"))]
 extern crate ra_ap_rustc_lexer as rustc_lexer;
diff --git a/src/tools/rust-analyzer/crates/test-utils/src/lib.rs b/src/tools/rust-analyzer/crates/test-utils/src/lib.rs
index 53d4a28bc309..088817b8357c 100644
--- a/src/tools/rust-analyzer/crates/test-utils/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/test-utils/src/lib.rs
@@ -6,7 +6,6 @@
 //! * Extracting markup (mainly, `$0` markers) out of fixture strings.
 //! * marks (see the eponymous module).
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
 #![allow(clippy::print_stderr)]
 
 mod assert_linear;
diff --git a/src/tools/rust-analyzer/crates/text-edit/src/lib.rs b/src/tools/rust-analyzer/crates/text-edit/src/lib.rs
index e2ff373c1baa..3efe0850d88d 100644
--- a/src/tools/rust-analyzer/crates/text-edit/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/text-edit/src/lib.rs
@@ -4,8 +4,6 @@
 //! so `TextEdit` is the ultimate representation of the work done by
 //! rust-analyzer.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 use itertools::Itertools;
 use std::cmp::max;
 pub use text_size::{TextRange, TextSize};
diff --git a/src/tools/rust-analyzer/crates/toolchain/src/lib.rs b/src/tools/rust-analyzer/crates/toolchain/src/lib.rs
index 2591ed16916e..a0603e35a09f 100644
--- a/src/tools/rust-analyzer/crates/toolchain/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/toolchain/src/lib.rs
@@ -1,7 +1,5 @@
 //! Discovery of `cargo` & `rustc` executables.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 use std::{env, iter, path::PathBuf};
 
 use camino::{Utf8Path, Utf8PathBuf};
diff --git a/src/tools/rust-analyzer/crates/tt/src/lib.rs b/src/tools/rust-analyzer/crates/tt/src/lib.rs
index b2a21b191326..369744d0e96c 100644
--- a/src/tools/rust-analyzer/crates/tt/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/tt/src/lib.rs
@@ -2,8 +2,6 @@
 //! input and output) of macros. It closely mirrors `proc_macro` crate's
 //! `TokenTree`.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 pub mod buffer;
 pub mod iter;
 
diff --git a/src/tools/rust-analyzer/crates/vfs-notify/src/lib.rs b/src/tools/rust-analyzer/crates/vfs-notify/src/lib.rs
index 1dbccab370c2..7e0f9af7af89 100644
--- a/src/tools/rust-analyzer/crates/vfs-notify/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/vfs-notify/src/lib.rs
@@ -7,8 +7,6 @@
 //! Hopefully, one day a reliable file watching/walking crate appears on
 //! crates.io, and we can reduce this to trivial glue code.
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 use std::{
     fs,
     path::{Component, Path},
diff --git a/src/tools/rust-analyzer/crates/vfs/src/lib.rs b/src/tools/rust-analyzer/crates/vfs/src/lib.rs
index 18c8699dd4d7..b3aa6e2fe113 100644
--- a/src/tools/rust-analyzer/crates/vfs/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/vfs/src/lib.rs
@@ -38,8 +38,6 @@
 //! [`Handle`]: loader::Handle
 //! [`Entries`]: loader::Entry
 
-#![warn(rust_2018_idioms, unused_lifetimes)]
-
 mod anchored_path;
 pub mod file_set;
 pub mod loader;