[GR-20446] Update Proc#to_s to Ruby 2.7 format

PullRequest: truffleruby/2204

Author: bjfish

spec/ruby/core/proc/shared/to_s.rb

@@ -33,8 +33,13 @@
 
   describe "for a proc created with UnboundMethod#to_proc" do
     it "returns a description including '(lambda)' and optionally including file and line number" do
-      def hello; end
-      method("hello").to_proc.send(@method).should =~ /^#<Proc:([^ ]*?)(#{sep}#{Regexp.escape __FILE__}:#{__LINE__ })? \(lambda\)>$/
+        def hello; end
+        s = method("hello").to_proc.send(@method)
+        if s.include? __FILE__
+          s.should =~ /^#<Proc:([^ ]*?)#{sep}#{Regexp.escape __FILE__}:#{__LINE__ - 3} \(lambda\)>$/
+        else
+          s.should =~ /^#<Proc:([^ ]*?) \(lambda\)>$/
+        end
     end
 
     it "has a binary encoding" do

spec/tags/core/proc/inspect_tags.txt

@@ -93,7 +93,7 @@ def to_s
     if sym = Primitive.proc_symbol_to_proc_symbol(self)
       suffix << "(&#{sym.inspect})"
     elsif file and line
-      suffix << "@#{file}:#{line}"
+      suffix << " #{file}:#{line}"
     end
     suffix << ' (lambda)' if lambda?
     base.b.insert(-2, suffix)