codeql/ruby/ql/test/library-tests/dataflow/local/local_dataflow.rb

def foo(a)
  b = a
  c = (p a; b)
  d = c = a
  d = (c = a)
  e = (a += b)
end

array = [1,2,3]
y = for x in array
do
  p x
end

for x in array do
  break 10
end

for x in array do
  if x > 1 then break end
end

while true
 break 5
end

# string flows to x
x = module M; "module" end
# string flows to x
x = class C; "class" end
# string does not flow to x because "def" evaluates to a method symbol
x = def bar; "method" end

def m x 
  if x == 4
     return 7
  end
  "reachable"
end

def m x 
  if x == 4
     return 7
  end
  return 6
  "unreachable"
end

m do
  next "next" if x < 4 
  break "break" if x < 9
  "normal"
end

foo([1, 2, 3])

def foo x
end