Cannot parse STEP AP203 output of Plasticity

[crabdancing]

I'm not sure if I'm doing something wrong, but I have ruststep added to my Cargo.toml like so:

[dependencies]
ruststep = { version = "0.4.0", features = ["ap201", "ap203"] }

With this as my test code:

fn main() {
    let string = std::fs::read_to_string("idler.step").unwrap();
    ruststep::parser::parse(&string).unwrap();
}

Which then errors like so:

thread 'main' panicked at src/main.rs:3:38:
called `Result::unwrap()` on an `Err` value: TokenizeFailed(Error while tokenizing STEP input
0: at line 20, in Tag:
DATA;
^

)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

The start of the file looks like this:

ISO-10303-21;
HEADER;

/* File generated by HOOPS Exchange Version 24.2.0 */

FILE_DESCRIPTION(('HOOPS Exchange Step'),'2;1');

FILE_NAME('/home/nikoru/Downloads/idler.step',
'2025-03-05T17:10:01+17:00',
('nikoru'),
('Unknown organisation'),
'HOOPS Exchange 2024.2',
'HOOPS Exchange',
'Unknown authorisation');

FILE_SCHEMA( ('AP203_CONFIGURATION_CONTROLLED_3D_DESIGN_OF_MECHANICAL_PARTS_AND_ASSEMBLIES_MIM_LF') );

ENDSEC;

DATA;
#3=(NAMED_UNIT(*)PLANE_ANGLE_UNIT()SI_UNIT($,.RADIAN.));
#4=PLANE_ANGLE_MEASURE_WITH_UNIT(PLANE_ANGLE_MEASURE(0.0174532925),#3);
#5=(CONVERSION_BASED_UNIT('DEGREE',#4)NAMED_UNIT(#6)PLANE_ANGLE_UNIT());

With the line DATA; being where the parser breaks.

I have attached the full file here:

idler.step.zip