Auto merge of #5380 - lzutao:deprecate-REPLACE_CONSTS, r=phansch

Deprecate REPLACE_CONSTS lint

Closes #5346
changelog: Deprecate `replace_consts` lint

8 files changed, 14 insertions, 466 deletions

diff --git a/README.md b/README.md
index 5ab3ab128a8..fefbb3486fd 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 A collection of lints to catch common mistakes and improve your [Rust](https://github.com/rust-lang/rust) code.
 
-[There are 362 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
+[There are 361 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
 
 We have a bunch of lint categories to allow you to choose how much Clippy is supposed to ~~annoy~~ help you:
 
diff --git a/clippy_lints/src/deprecated_lints.rs b/clippy_lints/src/deprecated_lints.rs
index 93c19bf9550..6e8ca647dd7 100644
--- a/clippy_lints/src/deprecated_lints.rs
+++ b/clippy_lints/src/deprecated_lints.rs
@@ -147,3 +147,11 @@ declare_deprecated_lint! {
     pub UNUSED_LABEL,
     "this lint has been uplifted to rustc and is now called `unused_labels`"
 }
+
+declare_deprecated_lint! {
+    /// **What it does:** Nothing. This lint has been deprecated.
+    ///
+    /// **Deprecation reason:** Associated-constants are now preferred.
+    pub REPLACE_CONSTS,
+    "associated-constants `MIN`/`MAX` of integers are prefer to `{min,max}_value()` and module constants"
+}
diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 140500afe0f..704b46a87c9 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -291,7 +291,6 @@ pub mod redundant_pub_crate;
 pub mod redundant_static_lifetimes;
 pub mod reference;
 pub mod regex;
-pub mod replace_consts;
 pub mod returns;
 pub mod serde_api;
 pub mod shadow;
@@ -470,6 +469,10 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         "clippy::unused_label",
         "this lint has been uplifted to rustc and is now called `unused_labels`",
     );
+    store.register_removed(
+        "clippy::replace_consts",
+        "associated-constants `MIN`/`MAX` of integers are prefer to `{min,max}_value()` and module constants",
+    );
     // end deprecated lints, do not remove this comment, it’s used in `update_lints`
 
     // begin register lints, do not remove this comment, it’s used in `update_lints`
@@ -755,7 +758,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &regex::INVALID_REGEX,
         &regex::REGEX_MACRO,
         &regex::TRIVIAL_REGEX,
-        &replace_consts::REPLACE_CONSTS,
         &returns::LET_AND_RETURN,
         &returns::NEEDLESS_RETURN,
         &returns::UNUSED_UNIT,
@@ -953,7 +955,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(|| box identity_conversion::IdentityConversion::default());
     store.register_late_pass(|| box types::ImplicitHasher);
     store.register_late_pass(|| box fallible_impl_from::FallibleImplFrom);
-    store.register_late_pass(|| box replace_consts::ReplaceConsts);
     store.register_late_pass(|| box types::UnitArg);
     store.register_late_pass(|| box double_comparison::DoubleComparisons);
     store.register_late_pass(|| box question_mark::QuestionMark);
@@ -1110,7 +1111,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&needless_pass_by_value::NEEDLESS_PASS_BY_VALUE),
         LintId::of(&non_expressive_names::SIMILAR_NAMES),
         LintId::of(&ranges::RANGE_PLUS_ONE),
-        LintId::of(&replace_consts::REPLACE_CONSTS),
         LintId::of(&shadow::SHADOW_UNRELATED),
         LintId::of(&strings::STRING_ADD_ASSIGN),
         LintId::of(&trait_bounds::TYPE_REPETITION_IN_BOUNDS),
diff --git a/clippy_lints/src/replace_consts.rs b/clippy_lints/src/replace_consts.rs
deleted file mode 100644
index aca1ebbd508..00000000000
--- a/clippy_lints/src/replace_consts.rs
+++ /dev/null
@@ -1,103 +0,0 @@
-use crate::utils::{match_def_path, span_lint_and_sugg};
-use if_chain::if_chain;
-use rustc_errors::Applicability;
-use rustc_hir::def::{DefKind, Res};
-use rustc_hir::{Expr, ExprKind, Node};
-use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::{declare_lint_pass, declare_tool_lint};
-
-declare_clippy_lint! {
-    /// **What it does:** Checks for usage of standard library
-    /// `const`s that could be replaced by `const fn`s.
-    ///
-    /// **Why is this bad?** `const fn`s exist
-    ///
-    /// **Known problems:** None.
-    ///
-    /// **Example:**
-    /// ```rust
-    /// let x = std::u32::MIN;
-    /// let y = std::u32::MAX;
-    /// ```
-    ///
-    /// Could be written:
-    ///
-    /// ```rust
-    /// let x = u32::min_value();
-    /// let y = u32::max_value();
-    /// ```
-    pub REPLACE_CONSTS,
-    pedantic,
-    "Lint usages of standard library `const`s that could be replaced by `const fn`s"
-}
-
-declare_lint_pass!(ReplaceConsts => [REPLACE_CONSTS]);
-
-fn in_pattern(cx: &LateContext<'_, '_>, expr: &Expr<'_>) -> bool {
-    let map = &cx.tcx.hir();
-    let parent_id = map.get_parent_node(expr.hir_id);
-
-    if let Some(node) = map.find(parent_id) {
-        if let Node::Pat(_) = node {
-            return true;
-        }
-    }
-
-    false
-}
-
-impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ReplaceConsts {
-    fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr<'_>) {
-        if_chain! {
-            if let ExprKind::Path(ref qp) = expr.kind;
-            if let Res::Def(DefKind::Const, def_id) = cx.tables.qpath_res(qp, expr.hir_id);
-            // Do not lint within patterns as function calls are disallowed in them
-            if !in_pattern(cx, expr);
-            then {
-                for &(ref const_path, repl_snip) in &REPLACEMENTS {
-                    if match_def_path(cx, def_id, const_path) {
-                        span_lint_and_sugg(
-                            cx,
-                            REPLACE_CONSTS,
-                            expr.span,
-                            &format!("using `{}`", const_path.last().expect("empty path")),
-                            "try this",
-                            repl_snip.to_string(),
-                            Applicability::MachineApplicable,
-                        );
-                        return;
-                    }
-                }
-            }
-        }
-    }
-}
-
-const REPLACEMENTS: [([&str; 3], &str); 24] = [
-    // Min
-    (["core", "isize", "MIN"], "isize::min_value()"),
-    (["core", "i8", "MIN"], "i8::min_value()"),
-    (["core", "i16", "MIN"], "i16::min_value()"),
-    (["core", "i32", "MIN"], "i32::min_value()"),
-    (["core", "i64", "MIN"], "i64::min_value()"),
-    (["core", "i128", "MIN"], "i128::min_value()"),
-    (["core", "usize", "MIN"], "usize::min_value()"),
-    (["core", "u8", "MIN"], "u8::min_value()"),
-    (["core", "u16", "MIN"], "u16::min_value()"),
-    (["core", "u32", "MIN"], "u32::min_value()"),
-    (["core", "u64", "MIN"], "u64::min_value()"),
-    (["core", "u128", "MIN"], "u128::min_value()"),
-    // Max
-    (["core", "isize", "MAX"], "isize::max_value()"),
-    (["core", "i8", "MAX"], "i8::max_value()"),
-    (["core", "i16", "MAX"], "i16::max_value()"),
-    (["core", "i32", "MAX"], "i32::max_value()"),
-    (["core", "i64", "MAX"], "i64::max_value()"),
-    (["core", "i128", "MAX"], "i128::max_value()"),
-    (["core", "usize", "MAX"], "usize::max_value()"),
-    (["core", "u8", "MAX"], "u8::max_value()"),
-    (["core", "u16", "MAX"], "u16::max_value()"),
-    (["core", "u32", "MAX"], "u32::max_value()"),
-    (["core", "u64", "MAX"], "u64::max_value()"),
-    (["core", "u128", "MAX"], "u128::max_value()"),
-];
diff --git a/src/lintlist/mod.rs b/src/lintlist/mod.rs
index 2888741cb45..5777e7d90e5 100644
--- a/src/lintlist/mod.rs
+++ b/src/lintlist/mod.rs
@@ -6,7 +6,7 @@ pub use lint::Lint;
 pub use lint::LINT_LEVELS;
 
 // begin lint list, do not remove this comment, it’s used in `update_lints`
-pub const ALL_LINTS: [Lint; 362] = [
+pub const ALL_LINTS: [Lint; 361] = [
     Lint {
         name: "absurd_extreme_comparisons",
         group: "correctness",
@@ -1793,13 +1793,6 @@ pub const ALL_LINTS: [Lint; 362] = [
         module: "regex",
     },
     Lint {
-        name: "replace_consts",
-        group: "pedantic",
-        desc: "Lint usages of standard library `const`s that could be replaced by `const fn`s",
-        deprecation: None,
-        module: "replace_consts",
-    },
-    Lint {
         name: "rest_pat_in_fully_bound_structs",
         group: "restriction",
         desc: "a match on a struct that binds all fields but still uses the wildcard pattern",
diff --git a/tests/ui/replace_consts.fixed b/tests/ui/replace_consts.fixed
deleted file mode 100644
index 108474408e0..00000000000
--- a/tests/ui/replace_consts.fixed
+++ /dev/null
@@ -1,99 +0,0 @@
-// run-rustfix
-#![feature(integer_atomics)]
-#![allow(unused_variables, clippy::blacklisted_name)]
-#![deny(clippy::replace_consts)]
-
-use std::sync::atomic::*;
-
-#[rustfmt::skip]
-fn bad() {
-    // Min
-    { let foo = isize::min_value(); };
-    { let foo = i8::min_value(); };
-    { let foo = i16::min_value(); };
-    { let foo = i32::min_value(); };
-    { let foo = i64::min_value(); };
-    { let foo = i128::min_value(); };
-    { let foo = usize::min_value(); };
-    { let foo = u8::min_value(); };
-    { let foo = u16::min_value(); };
-    { let foo = u32::min_value(); };
-    { let foo = u64::min_value(); };
-    { let foo = u128::min_value(); };
-    // Max
-    { let foo = isize::max_value(); };
-    { let foo = i8::max_value(); };
-    { let foo = i16::max_value(); };
-    { let foo = i32::max_value(); };
-    { let foo = i64::max_value(); };
-    { let foo = i128::max_value(); };
-    { let foo = usize::max_value(); };
-    { let foo = u8::max_value(); };
-    { let foo = u16::max_value(); };
-    { let foo = u32::max_value(); };
-    { let foo = u64::max_value(); };
-    { let foo = u128::max_value(); };
-}
-
-#[rustfmt::skip]
-fn good() {
-    // Atomic
-    { let foo = AtomicBool::new(false); };
-    { let foo = AtomicIsize::new(0); };
-    { let foo = AtomicI8::new(0); };
-    { let foo = AtomicI16::new(0); };
-    { let foo = AtomicI32::new(0); };
-    { let foo = AtomicI64::new(0); };
-    { let foo = AtomicUsize::new(0); };
-    { let foo = AtomicU8::new(0); };
-    { let foo = AtomicU16::new(0); };
-    { let foo = AtomicU32::new(0); };
-    { let foo = AtomicU64::new(0); };
-    // Min
-    { let foo = isize::min_value(); };
-    { let foo = i8::min_value(); };
-    { let foo = i16::min_value(); };
-    { let foo = i32::min_value(); };
-    { let foo = i64::min_value(); };
-    { let foo = i128::min_value(); };
-    { let foo = usize::min_value(); };
-    { let foo = u8::min_value(); };
-    { let foo = u16::min_value(); };
-    { let foo = u32::min_value(); };
-    { let foo = u64::min_value(); };
-    { let foo = u128::min_value(); };
-    // Max
-    { let foo = isize::max_value(); };
-    { let foo = i8::max_value(); };
-    { let foo = i16::max_value(); };
-    { let foo = i32::max_value(); };
-    { let foo = i64::max_value(); };
-    { let foo = i128::max_value(); };
-    { let foo = usize::max_value(); };
-    { let foo = u8::max_value(); };
-    { let foo = u16::max_value(); };
-    { let foo = u32::max_value(); };
-    { let foo = u64::max_value(); };
-    { let foo = u128::max_value(); };
-
-    let x = 42;
-
-    let _ = match x {
-        std::i8::MIN => -1,
-        1..=std::i8::MAX => 1,
-        _ => 0
-    };
-
-    let _ = if let std::i8::MIN = x {
-        -1
-    } else if let 1..=std::i8::MAX = x {
-        1
-    } else {
-        0
-    };
-}
-
-fn main() {
-    bad();
-    good();
-}
diff --git a/tests/ui/replace_consts.rs b/tests/ui/replace_consts.rs
deleted file mode 100644
index dae3422a35f..00000000000
--- a/tests/ui/replace_consts.rs
+++ /dev/null
@@ -1,99 +0,0 @@
-// run-rustfix
-#![feature(integer_atomics)]
-#![allow(unused_variables, clippy::blacklisted_name)]
-#![deny(clippy::replace_consts)]
-
-use std::sync::atomic::*;
-
-#[rustfmt::skip]
-fn bad() {
-    // Min
-    { let foo = std::isize::MIN; };
-    { let foo = std::i8::MIN; };
-    { let foo = std::i16::MIN; };
-    { let foo = std::i32::MIN; };
-    { let foo = std::i64::MIN; };
-    { let foo = std::i128::MIN; };
-    { let foo = std::usize::MIN; };
-    { let foo = std::u8::MIN; };
-    { let foo = std::u16::MIN; };
-    { let foo = std::u32::MIN; };
-    { let foo = std::u64::MIN; };
-    { let foo = std::u128::MIN; };
-    // Max
-    { let foo = std::isize::MAX; };
-    { let foo = std::i8::MAX; };
-    { let foo = std::i16::MAX; };
-    { let foo = std::i32::MAX; };
-    { let foo = std::i64::MAX; };
-    { let foo = std::i128::MAX; };
-    { let foo = std::usize::MAX; };
-    { let foo = std::u8::MAX; };
-    { let foo = std::u16::MAX; };
-    { let foo = std::u32::MAX; };
-    { let foo = std::u64::MAX; };
-    { let foo = std::u128::MAX; };
-}
-
-#[rustfmt::skip]
-fn good() {
-    // Atomic
-    { let foo = AtomicBool::new(false); };
-    { let foo = AtomicIsize::new(0); };
-    { let foo = AtomicI8::new(0); };
-    { let foo = AtomicI16::new(0); };
-    { let foo = AtomicI32::new(0); };
-    { let foo = AtomicI64::new(0); };
-    { let foo = AtomicUsize::new(0); };
-    { let foo = AtomicU8::new(0); };
-    { let foo = AtomicU16::new(0); };
-    { let foo = AtomicU32::new(0); };
-    { let foo = AtomicU64::new(0); };
-    // Min
-    { let foo = isize::min_value(); };
-    { let foo = i8::min_value(); };
-    { let foo = i16::min_value(); };
-    { let foo = i32::min_value(); };
-    { let foo = i64::min_value(); };
-    { let foo = i128::min_value(); };
-    { let foo = usize::min_value(); };
-    { let foo = u8::min_value(); };
-    { let foo = u16::min_value(); };
-    { let foo = u32::min_value(); };
-    { let foo = u64::min_value(); };
-    { let foo = u128::min_value(); };
-    // Max
-    { let foo = isize::max_value(); };
-    { let foo = i8::max_value(); };
-    { let foo = i16::max_value(); };
-    { let foo = i32::max_value(); };
-    { let foo = i64::max_value(); };
-    { let foo = i128::max_value(); };
-    { let foo = usize::max_value(); };
-    { let foo = u8::max_value(); };
-    { let foo = u16::max_value(); };
-    { let foo = u32::max_value(); };
-    { let foo = u64::max_value(); };
-    { let foo = u128::max_value(); };
-
-    let x = 42;
-
-    let _ = match x {
-        std::i8::MIN => -1,
-        1..=std::i8::MAX => 1,
-        _ => 0
-    };
-
-    let _ = if let std::i8::MIN = x {
-        -1
-    } else if let 1..=std::i8::MAX = x {
-        1
-    } else {
-        0
-    };
-}
-
-fn main() {
-    bad();
-    good();
-}
diff --git a/tests/ui/replace_consts.stderr b/tests/ui/replace_consts.stderr
deleted file mode 100644
index 458f63953ef..00000000000
--- a/tests/ui/replace_consts.stderr
+++ /dev/null
@@ -1,152 +0,0 @@
-error: using `MIN`
-  --> $DIR/replace_consts.rs:11:17
-   |
-LL |     { let foo = std::isize::MIN; };
-   |                 ^^^^^^^^^^^^^^^ help: try this: `isize::min_value()`
-   |
-note: the lint level is defined here
-  --> $DIR/replace_consts.rs:4:9
-   |
-LL | #![deny(clippy::replace_consts)]
-   |         ^^^^^^^^^^^^^^^^^^^^^^
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:12:17
-   |
-LL |     { let foo = std::i8::MIN; };
-   |                 ^^^^^^^^^^^^ help: try this: `i8::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:13:17
-   |
-LL |     { let foo = std::i16::MIN; };
-   |                 ^^^^^^^^^^^^^ help: try this: `i16::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:14:17
-   |
-LL |     { let foo = std::i32::MIN; };
-   |                 ^^^^^^^^^^^^^ help: try this: `i32::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:15:17
-   |
-LL |     { let foo = std::i64::MIN; };
-   |                 ^^^^^^^^^^^^^ help: try this: `i64::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:16:17
-   |
-LL |     { let foo = std::i128::MIN; };
-   |                 ^^^^^^^^^^^^^^ help: try this: `i128::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:17:17
-   |
-LL |     { let foo = std::usize::MIN; };
-   |                 ^^^^^^^^^^^^^^^ help: try this: `usize::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:18:17
-   |
-LL |     { let foo = std::u8::MIN; };
-   |                 ^^^^^^^^^^^^ help: try this: `u8::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:19:17
-   |
-LL |     { let foo = std::u16::MIN; };
-   |                 ^^^^^^^^^^^^^ help: try this: `u16::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:20:17
-   |
-LL |     { let foo = std::u32::MIN; };
-   |                 ^^^^^^^^^^^^^ help: try this: `u32::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:21:17
-   |
-LL |     { let foo = std::u64::MIN; };
-   |                 ^^^^^^^^^^^^^ help: try this: `u64::min_value()`
-
-error: using `MIN`
-  --> $DIR/replace_consts.rs:22:17
-   |
-LL |     { let foo = std::u128::MIN; };
-   |                 ^^^^^^^^^^^^^^ help: try this: `u128::min_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:24:17
-   |
-LL |     { let foo = std::isize::MAX; };
-   |                 ^^^^^^^^^^^^^^^ help: try this: `isize::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:25:17
-   |
-LL |     { let foo = std::i8::MAX; };
-   |                 ^^^^^^^^^^^^ help: try this: `i8::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:26:17
-   |
-LL |     { let foo = std::i16::MAX; };
-   |                 ^^^^^^^^^^^^^ help: try this: `i16::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:27:17
-   |
-LL |     { let foo = std::i32::MAX; };
-   |                 ^^^^^^^^^^^^^ help: try this: `i32::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:28:17
-   |
-LL |     { let foo = std::i64::MAX; };
-   |                 ^^^^^^^^^^^^^ help: try this: `i64::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:29:17
-   |
-LL |     { let foo = std::i128::MAX; };
-   |                 ^^^^^^^^^^^^^^ help: try this: `i128::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:30:17
-   |
-LL |     { let foo = std::usize::MAX; };
-   |                 ^^^^^^^^^^^^^^^ help: try this: `usize::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:31:17
-   |
-LL |     { let foo = std::u8::MAX; };
-   |                 ^^^^^^^^^^^^ help: try this: `u8::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:32:17
-   |
-LL |     { let foo = std::u16::MAX; };
-   |                 ^^^^^^^^^^^^^ help: try this: `u16::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:33:17
-   |
-LL |     { let foo = std::u32::MAX; };
-   |                 ^^^^^^^^^^^^^ help: try this: `u32::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:34:17
-   |
-LL |     { let foo = std::u64::MAX; };
-   |                 ^^^^^^^^^^^^^ help: try this: `u64::max_value()`
-
-error: using `MAX`
-  --> $DIR/replace_consts.rs:35:17
-   |
-LL |     { let foo = std::u128::MAX; };
-   |                 ^^^^^^^^^^^^^^ help: try this: `u128::max_value()`
-
-error: aborting due to 24 previous errors
-