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[ruby/rdoc] Add frozen string literal support
https://github.com/ruby/rdoc/commit/daac9d0471
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@ -12,7 +12,7 @@ class RDoc::ERBPartial < ERB
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def set_eoutvar compiler, eoutvar = '_erbout'
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super
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compiler.pre_cmd = ["#{eoutvar} ||= ''"]
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compiler.pre_cmd = ["#{eoutvar} ||= +''"]
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end
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end
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