panic on division by zero

[alexanderkjall]

Describe the bug

Expected an Error, not a panic.

To Reproduce

Can be reproduced with this program:

fn main() {
    let mut context = boa::Context::new();
    let _ = context.eval("1n/0n");
}

Expected behavior

An Error

Build environment (please complete the following information):

• OS: Ubuntu 20.04
• Version: 0.10.0
• Target triple: [e.g. x86_64-unknown-linux-gnu]
• Rustc version: 1.48.0-nightly (d006f5734 2020-08-28)

Additional context

Stacktrace:

thread 'main' panicked at 'attempt to divide by zero', /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/num-bigint-0.3.0/src/algorithms.rs:600:9
stack backtrace:
   0: std::panicking::begin_panic
             at /home/capitol/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:505
   1: num_bigint::biguint::algorithms::div_rem_ref
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/num-bigint-0.3.0/src/algorithms.rs:600
   2: <num_bigint::biguint::BigUint as num_integer::Integer>::div_rem
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/num-bigint-0.3.0/src/biguint.rs:1492
   3: <num_bigint::bigint::BigInt as num_integer::Integer>::div_rem
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/num-bigint-0.3.0/src/bigint.rs:2222
   4: <&num_bigint::bigint::BigInt as core::ops::arith::Div<&num_bigint::bigint::BigInt>>::div
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/num-bigint-0.3.0/src/bigint.rs:1716
   5: <num_bigint::bigint::BigInt as core::ops::arith::DivAssign<&num_bigint::bigint::BigInt>>::div_assign
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/num-bigint-0.3.0/src/bigint.rs:1724
   6: <num_bigint::bigint::BigInt as core::ops::arith::DivAssign>::div_assign
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/num-bigint-0.3.0/src/macros.rs:114
   7: boa::builtins::bigint::operations::<impl core::ops::arith::Div for boa::builtins::bigint::BigInt>::div
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/Boa-0.10.0/src/builtins/bigint/operations.rs:42
   8: boa::value::operations::<impl boa::value::Value>::div
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/Boa-0.10.0/src/value/operations.rs:109
   9: boa::exec::operator::<impl boa::exec::Executable for boa::syntax::ast::node::operator::BinOp>::run
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/Boa-0.10.0/src/exec/operator/mod.rs:62
  10: <boa::syntax::ast::node::Node as boa::exec::Executable>::run
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/Boa-0.10.0/src/exec/mod.rs:107
  11: boa::exec::statement_list::<impl boa::exec::Executable for boa::syntax::ast::node::statement_list::StatementList>::run
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/Boa-0.10.0/src/exec/statement_list.rs:17
  12: boa::context::Context::eval
             at /home/capitol/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/Boa-0.10.0/src/context.rs:494
  13: boa_reproduce::main
             at ./src/main.rs:3
  14: core::ops::function::FnOnce::call_once
             at /home/capitol/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:227

[Razican]

This seems to still be happening with the % (modulo) operator, I'm re-opening the issue.

[croraf]

@Razican Can you show the examples which produce the wrong result and that should work after this is fixed?

[Razican]

@Razican Can you show the examples which produce the wrong result and that should work after this is fixed?

Yep, for example this:

let a = 10 % 0;
a;

Panics, saying it entered unreachable code. It should return a NaN instead. This was solved for the division (/) operator, but not for the modulo (%) operator.