Bug #11721: String used as IO object buffer unexpectedly frozen if #to_sym called on it

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.3.0dev (2015-11-20 trunk 52685) [x86_64-darwin14]
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN

[[e-mail] (Thomas Walpole)]

A string with forced encoding used a buffer for reading from a File becomes frozen unexpectedly if #to_sym is called on it

file = File.open('some_file')
str = ""
str.force_encoding(Encoding::US_ASCII)
str.frozen? # => false
file.read(2,str)
str.frozen? # => false
str.to_sym
str.frozen? # => true

If the force_encoding is skipped str doesn't become frozen, same with reading from the file.

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset r52686.

---

symbol.c: not freeze the receiver

• symbol.c (rb_str_intern): should not freeze the receiver itself
  unexpectedly. [ruby-core:71611] [Bug #11721]