Fix puts for strings with non-ASCII-compatible encodings.

Author: nirvdrum

CHANGELOG.md

@@ -55,6 +55,7 @@ New features:
 * Fixed error when using arrows keys first within `irb` or `pry` (#1478, #1486).
 * Fixed `String#inspect` when the string uses a non-UTF-8 ASCII-compatible
   encoding and has non-ASCII characters.
+* Fixed `puts` for strings with non-ASCII-compatible encodings.
 
 Changes:
 

src/main/ruby/core/truffle/io_operations.rb

@@ -52,9 +52,16 @@ def self.puts(io, *args)
           end
 
           if str
-            # Truffle: write the string + record separator (\n) atomically so multithreaded #puts is bearable
-            unless str.end_with?(DEFAULT_RECORD_SEPARATOR)
-              str += DEFAULT_RECORD_SEPARATOR
+            # Truffle: write the string + record separator (\n) atomically so multi-threaded #puts is bearable
+            if str.encoding.ascii_compatible?
+              unless str.end_with?(DEFAULT_RECORD_SEPARATOR)
+                str += DEFAULT_RECORD_SEPARATOR
+              end
+            else
+              rs = DEFAULT_RECORD_SEPARATOR.encode(str.encoding)
+              unless str.end_with?(rs)
+                str += rs
+              end
             end
             io.write str
           end