Function rb_obj_instance_exec 

pub unsafe extern "C" fn rb_obj_instance_exec(
    argc: c_int,
    argv: *const VALUE,
    recv: VALUE,
) -> VALUE

Executes the given block within the context of the receiver. In order to set the context, the variable self is set to recv while the code is executing, giving the code access to recv’s instance variables. Arguments are passed as block parameters.

@param[in] argc Number of objects in argv @param[in] argv Arbitrary parameters to be passed to the block. @param[in] recv The object in question. @return What was evaluated. @note Don’t confuse this with rb_obj_instance_eval. The key difference is whether you can pass arbitrary parameters to the block, like this:

class Foo
  def initialize
    @foo = 5
  end
end
Foo.new.instance_exec(7) {|i| @foo + i } # => 12

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Generated by rb-sys for Ruby mri-x86_64-linux-gnu-3.2.3