Auto merge of rust-lang#5057 - rust-lang:pedantic_range_plus_one, r=flip1995

Downgrade range_plus_one to pedantic

This fixes rust-lang#2217

changelog: Downgrade [`range_plus_one`] to `pedantic`

Author: bors

clippy_lints/src/lib.rs

@@ -1068,6 +1068,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&needless_continue::NEEDLESS_CONTINUE),
         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),
@@ -1277,7 +1278,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
         LintId::of(&question_mark::QUESTION_MARK),
         LintId::of(&ranges::RANGE_MINUS_ONE),
-        LintId::of(&ranges::RANGE_PLUS_ONE),
         LintId::of(&ranges::RANGE_ZIP_WITH_LEN),
         LintId::of(&redundant_clone::REDUNDANT_CLONE),
         LintId::of(&redundant_field_names::REDUNDANT_FIELD_NAMES),
@@ -1495,7 +1495,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&precedence::PRECEDENCE),
         LintId::of(&ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
         LintId::of(&ranges::RANGE_MINUS_ONE),
-        LintId::of(&ranges::RANGE_PLUS_ONE),
         LintId::of(&ranges::RANGE_ZIP_WITH_LEN),
         LintId::of(&reference::DEREF_ADDROF),
         LintId::of(&reference::REF_IN_DEREF),

clippy_lints/src/ranges.rs

@@ -45,6 +45,10 @@ declare_clippy_lint! {
     /// and ends with a closing one.
     /// I.e., `let _ = (f()+1)..(f()+1)` results in `let _ = ((f()+1)..=f())`.
     ///
+    /// Also in many cases, inclusive ranges are still slower to run than
+    /// exclusive ranges, because they essentially add an extra branch that
+    /// LLVM may fail to hoist out of the loop.
+    ///
     /// **Example:**
     /// ```rust,ignore
     /// for x..(y+1) { .. }
@@ -54,7 +58,7 @@ declare_clippy_lint! {
     /// for x..=y { .. }
     /// ```
     pub RANGE_PLUS_ONE,
-    complexity,
+    pedantic,
     "`x..(y+1)` reads better as `x..=y`"
 }
 

src/lintlist/mod.rs

@@ -1654,7 +1654,7 @@ pub const ALL_LINTS: [Lint; 347] = [
     },
     Lint {
         name: "range_plus_one",
-        group: "complexity",
+        group: "pedantic",
         desc: "`x..(y+1)` reads better as `x..=y`",
         deprecation: None,
         module: "ranges",