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Implement as ceil/1 and floor/1 as new guard BIFs (essentially part of
Erlang language). They are guard BIFs because trunc/1 is a guard
BIF. It would be strange to have trunc/1 as a part of the language, but
not ceil/1 and floor/1.
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num_bif_SUITE.erl was originally copied from the emulator test
suite. It does not test much of the compiler.
Therefore, remove num_bif_SUITE. Add a new test to bif_SUITE
to test trunc/1 and round/1 in contexts that could be tricky
for the compiler to handle correctly. Note that there is no
need to test abs/1 in bif_SUITE, since it is tested in many
other places (e.g. in guard_SUITE).
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beam_validator wrongly complained that the following was
not safe because it didn't know that is_bitstring/1 is safe:
food(Curriculum) ->
[try
is_bitstring(functions)
catch _ ->
0
end, Curriculum].
While we are it, also add a new bif_SUITE test suite to cover some
more code in beam_validator.
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