RUNTIME ERROR: xxx
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	testdata/recursive_thunk:1:35-46	function <bar>

local bar(th, x) = if x == 0 then error "xxx" else th;

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	testdata/recursive_thunk:2:16-38	function <foo>

local foo(x) = bar(foo(x - 1), x - 1);

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	testdata/recursive_thunk:2:20-30	thunk from <function <foo>>

local foo(x) = bar(foo(x - 1), x - 1);

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	testdata/recursive_thunk:1:52-54	function <bar>

local bar(th, x) = if x == 0 then error "xxx" else th;

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	... (skipped 1 frames)
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	testdata/recursive_thunk:2:20-30	thunk from <function <foo>>

local foo(x) = bar(foo(x - 1), x - 1);

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	testdata/recursive_thunk:1:52-54	function <bar>

local bar(th, x) = if x == 0 then error "xxx" else th;

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	testdata/recursive_thunk:2:16-38	function <foo>

local foo(x) = bar(foo(x - 1), x - 1);

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	testdata/recursive_thunk:3:1-7	$

foo(3)

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	During evaluation