Assoc pattern matching (#3703)

[Feature #17260] One-line pattern matching using tASSOC

R-assignment is rejected instead.

4 files changed, 13 insertions, 11 deletions

diff --git a/spec/ruby/command_line/dash_upper_w_spec.rb b/spec/ruby/command_line/dash_upper_w_spec.rb
index 8343bc08e4..2b617f9f7f 100644
--- a/spec/ruby/command_line/dash_upper_w_spec.rb
+++ b/spec/ruby/command_line/dash_upper_w_spec.rb
@@ -32,10 +32,10 @@ ruby_version_is "2.7" do
 
   describe "The -W command line option with :no-experimental" do
     it "suppresses experimental warnings" do
-      result = ruby_exe('0 in a', args: '2>&1')
+      result = ruby_exe('case 0; in a; end', args: '2>&1')
       result.should =~ /is experimental/
 
-      result = ruby_exe('0 in a', options: '-W:no-experimental', args: '2>&1')
+      result = ruby_exe('case 0; in a; end', options: '-W:no-experimental', args: '2>&1')
       result.should == ""
     end
   end
diff --git a/spec/ruby/command_line/rubyopt_spec.rb b/spec/ruby/command_line/rubyopt_spec.rb
index ee4e594a1c..a739f23eb8 100644
--- a/spec/ruby/command_line/rubyopt_spec.rb
+++ b/spec/ruby/command_line/rubyopt_spec.rb
@@ -68,13 +68,13 @@ describe "Processing RUBYOPT" do
 
     it "suppresses experimental warnings for '-W:no-experimental'" do
       ENV["RUBYOPT"] = '-W:no-experimental'
-      result = ruby_exe('0 in a', args: '2>&1')
+      result = ruby_exe('case 0; in a; end', args: '2>&1')
       result.should == ""
     end
 
     it "suppresses deprecation and experimental warnings for '-W:no-deprecated -W:no-experimental'" do
       ENV["RUBYOPT"] = '-W:no-deprecated -W:no-experimental'
-      result = ruby_exe('($; = "") in a', args: '2>&1')
+      result = ruby_exe('case ($; = ""); in a; end', args: '2>&1')
       result.should == ""
     end
   end
diff --git a/spec/ruby/core/warning/element_set_spec.rb b/spec/ruby/core/warning/element_set_spec.rb
index ee83656cb4..a6b28282a0 100644
--- a/spec/ruby/core/warning/element_set_spec.rb
+++ b/spec/ruby/core/warning/element_set_spec.rb
@@ -8,8 +8,8 @@ ruby_version_is '2.7' do
     end
 
     it "emits and suppresses warnings for :experimental" do
-      ruby_exe('Warning[:experimental] = true; eval("0 in a")', args: "2>&1").should =~ /is experimental/
-      ruby_exe('Warning[:experimental] = false; eval("0 in a")', args: "2>&1").should == ""
+      ruby_exe('Warning[:experimental] = true; eval("case 0; in a; end")', args: "2>&1").should =~ /is experimental/
+      ruby_exe('Warning[:experimental] = false; eval("case 0; in a; end")', args: "2>&1").should == ""
     end
 
     it "raises for unknown category" do
diff --git a/spec/ruby/language/pattern_matching_spec.rb b/spec/ruby/language/pattern_matching_spec.rb
index 91ad23bf32..2d22ec7e64 100644
--- a/spec/ruby/language/pattern_matching_spec.rb
+++ b/spec/ruby/language/pattern_matching_spec.rb
@@ -9,11 +9,13 @@ ruby_version_is "2.7" do
       ScratchPad.record []
     end
 
-    it "can be standalone in operator that deconstructs value" do
-      eval(<<-RUBY).should == [0, 1]
-        [0, 1] in [a, b]
-        [a, b]
-      RUBY
+    ruby_version_is "3.0" do
+      it "can be standalone assoc operator that deconstructs value" do
+        eval(<<-RUBY).should == [0, 1]
+          [0, 1] => [a, b]
+          [a, b]
+        RUBY
+      end
     end
 
     it "extends case expression with case/in construction" do