Auto merge of #6347 - flip1995:changelog, r=Manishearth

Changelog Rust 1.48

[Rendered](https://github.com/flip1995/rust-clippy/blob/changelog/CHANGELOG.md)

This changelog is **big**. Hacktoberfest was pretty good for us, even though we had too few reviewers.

changelog: none

2 files changed, 134 insertions, 11 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64f67680b6c..b9e4b0e6704 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,11 +6,117 @@ document.
 
 ## Unreleased / In Rust Nightly
 
-[e636b88...master](https://github.com/rust-lang/rust-clippy/compare/e636b88...master)
+[b20d4c1...master](https://github.com/rust-lang/rust-clippy/compare/b20d4c1...master)
+
+## Rust 1.49
+
+Current beta, release 2020-12-31
+
+[e636b88...b20d4c1](https://github.com/rust-lang/rust-clippy/compare/e636b88...b20d4c1)
+
+### New Lints
+
+* [`field_reassign_with_default`] [#5911](https://github.com/rust-lang/rust-clippy/pull/5911)
+* [`await_holding_refcell_ref`] [#6029](https://github.com/rust-lang/rust-clippy/pull/6029)
+* [`disallowed_method`] [#6081](https://github.com/rust-lang/rust-clippy/pull/6081)
+* [`inline_asm_x86_att_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`inline_asm_x86_intel_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`from_iter_instead_of_collect`] [#6101](https://github.com/rust-lang/rust-clippy/pull/6101)
+* [`mut_mutex_lock`] [#6103](https://github.com/rust-lang/rust-clippy/pull/6103)
+* [`single_element_loop`] [#6109](https://github.com/rust-lang/rust-clippy/pull/6109)
+* [`manual_unwrap_or`] [#6123](https://github.com/rust-lang/rust-clippy/pull/6123)
+* [`large_types_passed_by_value`] [#6135](https://github.com/rust-lang/rust-clippy/pull/6135)
+* [`result_unit_err`] [#6157](https://github.com/rust-lang/rust-clippy/pull/6157)
+* [`ref_option_ref`] [#6165](https://github.com/rust-lang/rust-clippy/pull/6165)
+* [`manual_range_contains`] [#6177](https://github.com/rust-lang/rust-clippy/pull/6177)
+* [`unusual_byte_groupings`] [#6183](https://github.com/rust-lang/rust-clippy/pull/6183)
+* [`comparison_to_empty`] [#6226](https://github.com/rust-lang/rust-clippy/pull/6226)
+* [`map_collect_result_unit`] [#6227](https://github.com/rust-lang/rust-clippy/pull/6227)
+* [`manual_ok_or`] [#6233](https://github.com/rust-lang/rust-clippy/pull/6233)
+
+### Moves and Deprecations
+
+* Rename `single_char_push_str` to [`single_char_add_str`]
+  [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* Rename `zero_width_space` to [`invisible_characters`]
+  [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* Deprecate [`drop_bounds`] (uplifted)
+  [#6111](https://github.com/rust-lang/rust-clippy/pull/6111)
+* Move [`string_lit_as_bytes`] to `nursery`
+  [#6117](https://github.com/rust-lang/rust-clippy/pull/6117)
+* Move [`rc_buffer`] to `restriction`
+  [#6128](https://github.com/rust-lang/rust-clippy/pull/6128)
+
+### Enhancements
+
+* [`manual_memcpy`]: Also lint when there are loop counters (and produce a
+  reliable suggestion)
+  [#5727](https://github.com/rust-lang/rust-clippy/pull/5727)
+* [`single_char_add_str`]: Also lint on `String::insert_str`
+  [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* [`invisible_characters`]: Also lint the characters `\u{AD}` and `\u{2060}`
+  [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* [`eq_op`]: Also lint on the `assert_*!` macro family
+  [#6167](https://github.com/rust-lang/rust-clippy/pull/6167)
+* [`items_after_statements`]: Also lint in local macro expansions
+  [#6176](https://github.com/rust-lang/rust-clippy/pull/6176)
+* [`unnecessary_cast`]: Also lint casts on integer and float literals
+  [#6187](https://github.com/rust-lang/rust-clippy/pull/6187)
+* [`manual_unwrap_or`]: Also lint `Result::unwrap_or`
+  [#6190](https://github.com/rust-lang/rust-clippy/pull/6190)
+* [`match_like_matches_macro`]: Also lint when `match` has more than two arms
+  [#6216](https://github.com/rust-lang/rust-clippy/pull/6216)
+* [`integer_arithmetic`]: Better handle `/` an `%` operators
+  [#6229](https://github.com/rust-lang/rust-clippy/pull/6229)
+
+### False Positive Fixes
+
+* [`needless_lifetimes`]: Bail out if the function has a `where` clause with the
+  lifetime [#5978](https://github.com/rust-lang/rust-clippy/pull/5978)
+* [`explicit_counter_loop`]: No longer lints, when loop counter is used after it
+  is incremented [#6076](https://github.com/rust-lang/rust-clippy/pull/6076)
+* [`or_fun_call`]: Revert changes addressing the handling of `const fn`
+  [#6077](https://github.com/rust-lang/rust-clippy/pull/6077)
+* [`needless_range_loop`]: No longer lints, when the iterable is used in the
+  range [#6102](https://github.com/rust-lang/rust-clippy/pull/6102)
+* [`inconsistent_digit_grouping`]: Fix bug when using floating point exponent
+  [#6104](https://github.com/rust-lang/rust-clippy/pull/6104)
+* [`mistyped_literal_suffixes`]: No longer lints on the fractional part of a
+  float (e.g. `713.32_64`)
+  [#6114](https://github.com/rust-lang/rust-clippy/pull/6114)
+* [`invalid_regex`]: No longer lint on unicode characters within `bytes::Regex`
+  [#6132](https://github.com/rust-lang/rust-clippy/pull/6132)
+* [`boxed_local`]: No longer lints on `extern fn` arguments
+  [#6133](https://github.com/rust-lang/rust-clippy/pull/6133)
+* [`needless_lifetimes`]: Fix regression, where lifetime is used in `where`
+  clause [#6198](https://github.com/rust-lang/rust-clippy/pull/6198)
+
+### Suggestion Fixes/Improvements
+
+* [`unnecessary_sort_by`]: Avoid dereferencing the suggested closure parameter
+  [#6078](https://github.com/rust-lang/rust-clippy/pull/6078)
+* [`needless_arbitrary_self_type`]: Correctly handle expanded code
+  [#6093](https://github.com/rust-lang/rust-clippy/pull/6093)
+* [`useless_format`]: Preserve raw strings in suggestion
+  [#6151](https://github.com/rust-lang/rust-clippy/pull/6151)
+* [`empty_loop`]: Suggest alternatives
+  [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`borrowed_box`]: Correctly add parentheses in suggestion
+  [#6200](https://github.com/rust-lang/rust-clippy/pull/6200)
+* [`unused_unit`]: Improve suggestion formatting
+  [#6247](https://github.com/rust-lang/rust-clippy/pull/6247)
+
+### Documentation Improvements
+
+* Some doc improvements:
+    * [`rc_buffer`] [#6090](https://github.com/rust-lang/rust-clippy/pull/6090)
+    * [`empty_loop`] [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`doc_markdown`]: Document problematic link text style
+  [#6107](https://github.com/rust-lang/rust-clippy/pull/6107)
 
 ## Rust 1.48
 
-Current beta, release 2020-11-19
+Current stable, released 2020-11-19
 
 [09bd400...e636b88](https://github.com/rust-lang/rust-clippy/compare/09bd400...e636b88)
 
@@ -56,7 +162,7 @@ Current beta, release 2020-11-19
 
 * [`useless_attribute`]: permit allowing [`wildcard_imports`] and [`enum_glob_use`]
   [#5994](https://github.com/rust-lang/rust-clippy/pull/5994)
-* [`transmute_ptr_to_ptr`]: avoid suggesting dereferencing raw pointers in const contexts 
+* [`transmute_ptr_to_ptr`]: avoid suggesting dereferencing raw pointers in const contexts
   [#5999](https://github.com/rust-lang/rust-clippy/pull/5999)
 * [`redundant_closure_call`]: take into account usages of the closure in nested functions and closures
   [#5920](https://github.com/rust-lang/rust-clippy/pull/5920)
@@ -64,7 +170,7 @@ Current beta, release 2020-11-19
   [#5949](https://github.com/rust-lang/rust-clippy/pull/5949)
 * [`doc_markdown`]: allow using "GraphQL" without backticks
   [#5996](https://github.com/rust-lang/rust-clippy/pull/5996)
-* [`to_string_in_display`]: avoid linting when calling `to_string()` on anything that is not `self` 
+* [`to_string_in_display`]: avoid linting when calling `to_string()` on anything that is not `self`
   [#5971](https://github.com/rust-lang/rust-clippy/pull/5971)
 * [`indexing_slicing`] and [`out_of_bounds_indexing`] treat references to arrays as arrays
   [#6034](https://github.com/rust-lang/rust-clippy/pull/6034)
@@ -85,19 +191,19 @@ Current beta, release 2020-11-19
   [#5946](https://github.com/rust-lang/rust-clippy/pull/5946)
 * [`useless_conversion`]: show the type in the error message
   [#6035](https://github.com/rust-lang/rust-clippy/pull/6035)
-* [`unnecessary_mut_passed`]: discriminate between functions and methods in the error message 
+* [`unnecessary_mut_passed`]: discriminate between functions and methods in the error message
   [#5892](https://github.com/rust-lang/rust-clippy/pull/5892)
 * [`float_cmp`] and [`float_cmp_const`]: change wording to make margin of error less ambiguous
   [#6043](https://github.com/rust-lang/rust-clippy/pull/6043)
 * [`default_trait_access`]: do not use unnecessary type parameters in the suggestion
   [#5993](https://github.com/rust-lang/rust-clippy/pull/5993)
-* [`collapsible_if`]: don't use expanded code in the suggestion 
+* [`collapsible_if`]: don't use expanded code in the suggestion
   [#5992](https://github.com/rust-lang/rust-clippy/pull/5992)
 * Do not suggest empty format strings in [`print_with_newline`] and [`write_with_newline`]
   [#6042](https://github.com/rust-lang/rust-clippy/pull/6042)
 * [`unit_arg`]: improve the readability of the suggestion
   [#5931](https://github.com/rust-lang/rust-clippy/pull/5931)
-* [`stable_sort_primitive`]: print the type that is being sorted in the lint message 
+* [`stable_sort_primitive`]: print the type that is being sorted in the lint message
   [#5935](https://github.com/rust-lang/rust-clippy/pull/5935)
 * Show line count and max lines in [`too_many_lines`] lint message
   [#6009](https://github.com/rust-lang/rust-clippy/pull/6009)
@@ -105,7 +211,7 @@ Current beta, release 2020-11-19
   [#5900](https://github.com/rust-lang/rust-clippy/pull/5900)
 * [`option_map_unit_fn`] and [`result_map_unit_fn`]: print the unit type `()` explicitly
   [#6024](https://github.com/rust-lang/rust-clippy/pull/6024)
-* [`redundant_allocation`]: suggest replacing `Rc<Box<T>>` with `Rc<T>` 
+* [`redundant_allocation`]: suggest replacing `Rc<Box<T>>` with `Rc<T>`
   [#5899](https://github.com/rust-lang/rust-clippy/pull/5899)
 * Make lint messages adhere to rustc dev guide conventions
   [#5893](https://github.com/rust-lang/rust-clippy/pull/5893)
@@ -128,7 +234,7 @@ Current beta, release 2020-11-19
 
 ## Rust 1.47
 
-Current stable, released 2020-10-08
+Released 2020-10-08
 
 [c2c07fa...09bd400](https://github.com/rust-lang/rust-clippy/compare/c2c07fa...09bd400)
 
diff --git a/doc/changelog_update.md b/doc/changelog_update.md
index 49726464957..115848c4804 100644
--- a/doc/changelog_update.md
+++ b/doc/changelog_update.md
@@ -29,8 +29,11 @@ bullet points might be helpful:
 * When writing the release notes for the **upcoming beta release**, you need to check
   out the Clippy commit of the current Rust `master`. [Link][rust_master_tools]
 * When writing the (forgotten) release notes for a **past stable release**, you
-  need to select the Rust release tag from the dropdown and then check the
-  commit of the Clippy directory:
+  need to check out the Rust release tag of the stable release.
+  [Link][rust_stable_tools]
+
+Usually you want to wirte the changelog of the **upcoming stable release**. Make
+sure though, that `beta` was already branched in the Rust repository.
 
 To find the commit hash, issue the following command when in a `rust-lang/rust` checkout:
 ```
@@ -71,6 +74,19 @@ The order should roughly be:
 7. Documentation improvements
 8. Others
 
+As section headers, we use:
+
+```
+### New Lints
+### Moves and Deprecations
+### Enhancements
+### False Positive Fixes
+### Suggestion Fixes/Improvements
+### ICE Fixes
+### Documentation Improvements
+### Others
+```
+
 Please also be sure to update the Beta/Unreleased sections at the top with the
 relevant commit ranges.
 
@@ -78,3 +94,4 @@ relevant commit ranges.
 [forge]: https://forge.rust-lang.org/
 [rust_master_tools]: https://github.com/rust-lang/rust/tree/master/src/tools/clippy
 [rust_beta_tools]: https://github.com/rust-lang/rust/tree/beta/src/tools/clippy
+[rust_stable_tools]: https://github.com/rust-lang/rust/releases