relnotes/v0.40.0.md
### New features
* [#2997](https://github.com/rubocop/rubocop/pull/2997): `Performance/CaseWhenSplat` can now identify multiple offenses in the same branch and offenses that do not occur as the first argument. ([@rrosenblum][])
* [#2928](https://github.com/rubocop/rubocop/issues/2928): `Style/NestedParenthesizedCalls` cop can auto-correct. ([@drenmi][])
* `Style/RaiseArgs` cop can auto-correct. ([@drenmi][])
* [#2993](https://github.com/rubocop/rubocop/pull/2993): `Style/SpaceAfterColon` now checks optional keyword arguments. ([@owst][])
* [#3003](https://github.com/rubocop/rubocop/pull/3003): Read command line options from `.rubocop` file and `RUBOCOP_OPTS` environment variable. ([@bolshakov][])
* [#2857](https://github.com/rubocop/rubocop/issues/2857): `Style/MultilineArrayBraceLayout` enforced style is configurable and supports `symmetrical` and `new_line` options. ([@panthomakos][])
* [#2857](https://github.com/rubocop/rubocop/issues/2857): `Style/MultilineHashBraceLayout` enforced style is configurable and supports `symmetrical` and `new_line` options. ([@panthomakos][])
* [#2857](https://github.com/rubocop/rubocop/issues/2857): `Style/MultilineMethodCallBraceLayout` enforced style is configurable and supports `symmetrical` and `new_line` options. ([@panthomakos][])
* [#2857](https://github.com/rubocop/rubocop/issues/2857): `Style/MultilineMethodDefinitionBraceLayout` enforced style is configurable and supports `symmetrical` and `new_line` options. ([@panthomakos][])
* [#3052](https://github.com/rubocop/rubocop/pull/3052): `Style/MultilineArrayBraceLayout` enforced style supports `same_line` option. ([@panthomakos][])
* [#3052](https://github.com/rubocop/rubocop/pull/3052): `Style/MultilineHashBraceLayout` enforced style supports `same_line` option. ([@panthomakos][])
* [#3052](https://github.com/rubocop/rubocop/pull/3052): `Style/MultilineMethodCallBraceLayout` enforced style supports `same_line` option. ([@panthomakos][])
* [#3052](https://github.com/rubocop/rubocop/pull/3052): `Style/MultilineMethodDefinitionBraceLayout` enforced style supports `same_line` option. ([@panthomakos][])
* [#3019](https://github.com/rubocop/rubocop/issues/3019): Add new `Style/EmptyCaseCondition` cop. ([@owst][], [@rrosenblum][])
* [#3072](https://github.com/rubocop/rubocop/pull/3072): Add new `Lint/UselessArraySplat` cop. ([@owst][])
* [#3022](https://github.com/rubocop/rubocop/issues/3022): `Style/Lambda` enforced style supports `literal` option. ([@drenmi][])
* [#2909](https://github.com/rubocop/rubocop/issues/2909): `Style/Lambda` enforced style supports `lambda` option. ([@drenmi][])
* [#3092](https://github.com/rubocop/rubocop/pull/3092): Allow `Style/Encoding` to enforce using no encoding comments. ([@NobodysNightmare][])
* New cop `Rails/UniqBeforePluck` checks that `uniq` is used before `pluck`. ([@tjwp][])
### Bug fixes
* [#3112](https://github.com/rubocop/rubocop/issues/3112): Fix `Style/ClassAndModuleChildren` for nested classes with explicit superclass. ([@jspanjers][])
* [#3032](https://github.com/rubocop/rubocop/issues/3032): Fix autocorrecting parentheses for predicate methods without space before args. ([@graemeboy][])
* [#3000](https://github.com/rubocop/rubocop/pull/3000): Fix encoding crash on HTML output. ([@gerrywastaken][])
* [#2983](https://github.com/rubocop/rubocop/pull/2983): `Style/AlignParameters` message was clarified for `with_fixed_indentation` style. ([@dylanahsmith][])
* [#2314](https://github.com/rubocop/rubocop/pull/2314): Ignore `UnusedBlockArgument` for keyword arguments. ([@volkert][])
* [#2975](https://github.com/rubocop/rubocop/issues/2975): Make comment indentation before `)` consistent with comment indentation before `}` or `]`. ([@jonas054][])
* [#3010](https://github.com/rubocop/rubocop/issues/3010): Fix double reporting/correction of spaces after ternary operator colons (now only reported by `Style/SpaceAroundOperators`, and not `Style/SpaceAfterColon` too). ([@owst][])
* [#3006](https://github.com/rubocop/rubocop/issues/3006): Register an offense for calling `merge!` on a method on a variable inside `each_with_object` in `Performance/RedundantMerge`. ([@lumeet][], [@rrosenblum][])
* [#2886](https://github.com/rubocop/rubocop/issues/2886): Custom cop changes now bust the cache. ([@ptarjan][])
* [#3043](https://github.com/rubocop/rubocop/issues/3043): `Style/SpaceAfterNot` will now register an offense for a receiver that is wrapped in parentheses. ([@rrosenblum][])
* [#3039](https://github.com/rubocop/rubocop/issues/3039): Accept `match` without a receiver in `Performance/EndWith`. ([@lumeet][])
* [#3039](https://github.com/rubocop/rubocop/issues/3039): Accept `match` without a receiver in `Performance/StartWith`. ([@lumeet][])
* [#3048](https://github.com/rubocop/rubocop/issues/3048): `Lint/NestedMethodDefinition` shouldn't flag methods defined on Structs. ([@owst][])
* [#2912](https://github.com/rubocop/rubocop/issues/2912): Check whether a line is aligned with the following line if the preceding line is not an assignment. ([@akihiro17][])
* [#3036](https://github.com/rubocop/rubocop/issues/3036): Don't let `Lint/UnneededDisable` inspect files that are excluded for the cop. ([@jonas054][])
* [#2874](https://github.com/rubocop/rubocop/issues/2874): Fix bug when the closing parenthesis is preceded by a newline in array and hash literals in `Style/RedundantParentheses`. ([@lumeet][])
* [#3049](https://github.com/rubocop/rubocop/issues/3049): Make `Lint/UselessAccessModifier` detect conditionally defined methods and correctly handle dynamically defined methods and singleton class methods. ([@owst][])
* [#3004](https://github.com/rubocop/rubocop/pull/3004): Don't add `Style/Alias` offenses for use of `alias` in `instance_eval` blocks, since object instances don't respond to `alias_method`. ([@magni-][])
* [#3061](https://github.com/rubocop/rubocop/pull/3061): Custom cops now show up in --show-cops. ([@ptarjan][])
* [#3088](https://github.com/rubocop/rubocop/pull/3088): Ignore offenses that involve conflicting HEREDOCs in the `Style/Multiline*BraceLayout` cops. ([@panthomakos][])
* [#3083](https://github.com/rubocop/rubocop/issues/3083): Do not register an offense for splat block args in `Style/SymbolProc`. ([@rrosenblum][])
* [#3063](https://github.com/rubocop/rubocop/issues/3063): Don't auto-correct `a + \` into `a + \\` in `Style/LineEndConcatenation`. ([@jonas054][])
* [#3034](https://github.com/rubocop/rubocop/issues/3034): Report offenses for `RuntimeError.new(msg)` in `Style/RedundantException`. ([@jonas054][])
* [#3016](https://github.com/rubocop/rubocop/issues/3016): `Style/SpaceAfterComma` now uses `Style/SpaceInsideHashLiteralBraces`'s setting. ([@ptarjan][])
### Changes
* [#2995](https://github.com/rubocop/rubocop/issues/2995): Removed deprecated path matching syntax. ([@gerrywastaken][])
* [#3025](https://github.com/rubocop/rubocop/pull/3025): Removed deprecation warnings for `rubocop-todo.yml`. ([@ptarjan][])
* [#3028](https://github.com/rubocop/rubocop/pull/3028): Add `define_method` to the default list of `IgnoredMethods` of `Style/SymbolProc`. ([@jastkand][])
* [#3064](https://github.com/rubocop/rubocop/pull/3064): `Style/SpaceAfterNot` highlights the entire expression instead of just the exclamation mark. ([@rrosenblum][])
* [#3085](https://github.com/rubocop/rubocop/pull/3085): Enable `Style/MultilineArrayBraceLayout` and `Style/MultilineHashBraceLayout` with the `symmetrical` style by default. ([@panthomakos][])
* [#3091](https://github.com/rubocop/rubocop/pull/3091): Enable `Style/MultilineMethodCallBraceLayout` and `Style/MultilineMethodDefinitionBraceLayout` with the `symmetrical` style by default. ([@panthomakos][])
* [#1830](https://github.com/rubocop/rubocop/pull/1830): `Style/PredicateName` now ignores the `spec/` directory, since there is a strong convention for using `have_*` and `be_*` helper methods in RSpec. ([@gylaz][])
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