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// RUN: %boogie -noinfer -useArrayTheory "%s" > "%t"
// RUN: %diff "%s.expect" "%t"
procedure{:extern}{:yields}{:layer 1,2} P1();
requires{:layer 1} false;
ensures{:atomic} |{ A: return true; }|;
procedure{:yields}{:layer 2,3} P2()
ensures{:atomic} |{ A: return true; }|;
{
assert{:layer 1} false;
yield;
call P1();
yield;
}
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