Re: Subst should not stringify a callable if it didn't match the arguments

If you put this into a SConstruct file:

def a_bad_generator(target, source, env, for_signature):
    """Cause any kind of TypeError in this function."""
    5 + ’s’ # Raises a type error

env_vars = Variables()
env_vars.Add(
    'BAD_VAR',
    help="I'm going to behave unexpectedly",
    default=a_bad_generator,
)

env = Environment(
    variables=env_vars
)

print(env.subst('$BAD_VAR/repro_this_bug'))

And run scons you will see:


@homebase ➜  scons_repro scons
scons: Reading SConscript files ...
<function a_bad_generator at 0x107a53bf8>/repro_this_bug
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.
@homebase ➜  scons_repro

This is with version 3.0.4

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