Bug #16932: `defined?` on refined method call returns non-nil even before `using`

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 2.8.0dev (2020-06-03T10:13:36Z master ee35a4dad3)
• Backport: 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED

[nobu (Nobuyoshi Nakada)]

From 2.0 to master (ee35a4dad3), the second defined?(a.x) before using returns truthy value.

class A
end

a = A.new
p defined?(a.x) #=> nil (OK)

m = Module.new do
  refine(A) do
    def x
    end
  end
end

a.x rescue p $! #=> NoMethodError: undefined method `x'
p defined?(a.x) #=> "method" (NG)

using m
p defined?(a.x) #=> "method" (OK)

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|8340c773e54feb399c9fab322e3ff6dd578ac04d.

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Properly resolve refinements in defined? on method call [Bug #16932]