Bug #12031: Make ERB work with --enable-frozen-string-literal

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.4.0dev (2016-01-26) [i386-openbsd]
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[jeremyevans0 (Jeremy Evans)]

ERB currently does not work with --enable-frozen-string-literal:

$ echo "a" | RUBYOPT=--enable-frozen-string-literal erb
-:1:in `concat': can't modify frozen String (RuntimeError)
        from -:1:in `<main>'
        from /usr/local/lib/ruby/2.3/erb.rb:864:in `eval'
        from /usr/local/lib/ruby/2.3/erb.rb:864:in `result'
        from /usr/local/lib/ruby/2.3/erb.rb:846:in `run'
        from /usr/local/bin/erb23:149:in `run'
        from /usr/local/bin/erb23:170:in `<main>'

The attached patch makes it work with --enable-frozen-string-literal:

$ echo "a" | RUBYOPT=--enable-frozen-string-literal RUBYLIB=~/ruby/lib erb
a

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset r53682.

---

erb.rb: frozen-string-literal safe

• lib/erb.rb (ERB#set_eoutvar): explicitly make mutable string as
  a buffer to make ERB work with --enable-frozen-string-literal.
  [ruby-core:73561] [Bug #12031]