def boom
  raise "boom"
end
y = ""
y = boom rescue "fine"
puts y # "fine"

So far so good; the precedence of "rescue" is higher than that of
assignment. But now:

def boom
  raise "boom"
end
y = ""
y += boom rescue "fine"
puts y # ""

How does the precedence work here, and should this behavior be
considered a possible bug? m.

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