gleam-lang/gleam · error

modulo result to be a valid u32

Error message

modulo result to be a valid u32

What it means

Error "modulo result to be a valid u32" thrown in gleam-lang/gleam.

Source

Thrown at compiler-core/src/javascript.rs:1654

    // Convert size to u32. This is safe because this function isn't called with a size greater
    // than `SAFE_INT_SEGMENT_MAX_SIZE`.
    let size = size
        .to_u32()
        .expect("bit array segment size to be a valid u32");

    // Convert negative number to two's complement representation
    if value < BigInt::ZERO {
        let value_modulus = BigInt::from(2).pow(size);
        value = &value_modulus + (value % &value_modulus);
    }

    // Convert value to the desired number of bytes
    let mut bytes = vec![0u8; size as usize / 8];
    for byte in bytes.iter_mut() {
        *byte = (&value % BigInt::from(256))
            .to_u8()
            .expect("modulo result to be a valid u32");
        value /= BigInt::from(256);
    }

    if endianness.is_big() {
        bytes.reverse();
    }

    bytes
}

View on GitHub (pinned to 7e623aa83d)

When it happens

Trigger: Thrown at compiler-core/src/javascript.rs:1654 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gleam-lang/gleam@7e623aa83d (2026-08-17). Data as JSON: /api/errors/6bde2f5147200937. Report an issue: GitHub.