Drop ruby 2.3 support (#554)

.circleci/config.yml

@@ -146,38 +146,6 @@ workflows:
 
   test:
     jobs:
-      - spec:
-          name: 2.3-readline-gcc
-          executor:
-            name: test
-            version: 2.3.8
-            line_editor: readline
-            compiler: gcc
-
-      - spec:
-          name: 2.3-libedit-gcc
-          executor:
-            name: test
-            version: 2.3.8
-            line_editor: libedit
-            compiler: gcc
-
-      - spec:
-          name: 2.3-readline-clang
-          executor:
-            name: test
-            version: 2.3.8
-            line_editor: readline
-            compiler: clang
-
-      - spec:
-          name: 2.3-libedit-clang
-          executor:
-            name: test
-            version: 2.3.8
-            line_editor: libedit
-            compiler: clang
-
       - spec:
           name: 2.4-readline-gcc
           executor:
@@ -308,11 +276,6 @@ workflows:
 
       - upload_coverage:
           requires:
-            - 2.3-readline-gcc
-            - 2.3-libedit-gcc
-            - 2.3-readline-clang
-            - 2.3-libedit-clang
-
             - 2.4-readline-gcc
             - 2.4-libedit-gcc
             - 2.4-readline-clang

.rubocop.yml

@@ -7,7 +7,7 @@ AllCops:
   DisplayCopNames: true
   DisplayStyleGuide: true
 
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.4
 
 Layout/ExtraSpacing:
   AllowForAlignment: false

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Removed
+
+* Support for MRI 2.3. Byebug no longer installs on this platform.
+
 ## [11.0.1] - 2019-03-18
 
 ### Fixed

README.md

@@ -47,7 +47,7 @@ Windows [![Vey][vey]][vey_url]
 
 ## Requirements
 
-MRI 2.3.0 or higher.
+MRI 2.4.0 or higher.
 
 ## Install
 

appveyor.yml

@@ -38,7 +38,6 @@ test_script:
 
 environment:
   matrix:
-    - ruby_version: 23-x64
     - ruby_version: 24-x64
     - ruby_version: 25-x64
     - ruby_version: 26-x64

byebug.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
     can build on. It provides breakpoint handling and bindings for stack frames
     among other things and it comes with an easy to use command line interface."
 
-  s.required_ruby_version = ">= 2.3.0"
+  s.required_ruby_version = ">= 2.4.0"
 
   s.files = Dir["lib/**/*.rb", "lib/**/*.yml", "ext/**/*.[ch]", "LICENSE"]
   s.bindir = "exe"

docker/manager.rb

@@ -10,7 +10,6 @@ module Docker
   #
   class Manager
     VERSIONS = %w[
-      2.3.8
       2.4.5
       2.5.5
       2.6.2

lib/byebug/commands/set.rb

@@ -50,7 +50,7 @@ def execute
       if !setting.boolean? && value.nil?
         err = pr("set.errors.must_specify_value", key: key)
       elsif setting.boolean?
-        value, err = get_onoff(value, key =~ /^no/ ? false : true)
+        value, err = get_onoff(value, /^no/.match?(key) ? false : true)
       elsif setting.integer?
         value, err = get_int(value, setting.to_sym, 1)
       end

lib/byebug/setting.rb

@@ -52,7 +52,7 @@ def []=(name, value)
       end
 
       def find(shortcut)
-        abbr = shortcut =~ /^no/ ? shortcut[2..-1] : shortcut
+        abbr = /^no/.match?(shortcut) ? shortcut[2..-1] : shortcut
         matches = settings.select do |key, value|
           key =~ (value.boolean? ? /#{abbr}/ : /#{shortcut}/)
         end

test/commands/where_test.rb

@@ -120,7 +120,7 @@ def test_where_displays_instance_exec_block_frames
   #   are usually very deeply nested and on OS X where tmp path is always
   #   deeply nested.
   #
-  unless /cygwin|mswin|mingw|darwin/ =~ RUBY_PLATFORM
+  unless /cygwin|mswin|mingw|darwin/.match?(RUBY_PLATFORM)
     class WhereWithNotDeeplyNestedPathsTest < WhereStandardTest
       def test_where_displays_current_backtrace_w_shorpaths_if_fullpath_disabled
         enter "set nofullpath", "where", "set fullpath"

test/minitest_runner.rb

@@ -48,7 +48,7 @@ def test_suites
     end
 
     def test_methods(str)
-      if str =~ /test_.*/
+      if /test_.*/.match?(str)
         filter_runnables_by_method(str)
       else
         filter_runnables_by_class(str)