Panic when using unary operations on this

[addisoncrump]

Describe the bug
Using a unary operator on this causes boa to panic.

To Reproduce
Execute the following script:

++this;

Which causes the following error:

thread 'main' panicked at 'not yet implemented: access_set `this`', boa_engine/src/bytecompiler/mod.rs:828:29
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Expected behavior
Boa should issue a syntax error with an invalid operand.

Additional context
Discovered by #2401

[e-codes-stuff]

This is only disallowed for specifically the unary operations which would assign to this right? I think it would be possible to add in the error by turning this code in bytecompiler/expression/unary.rs from this:

            UnaryOp::DecrementPost => {
                // TODO: promote to an early error.
                let access = Access::from_expression(unary.target()).ok_or_else(|| {
                    JsNativeError::syntax().with_message("Invalid decrement operand")
                })?;

To something like this:

            UnaryOp::DecrementPost => {
                // TODO: promote to an early error.
                let access = Access::from_expression(unary.target())
                    .filter(|a| a != Access::This)
                    .ok_or_else(|| {
                        JsNativeError::syntax().with_message("Invalid decrement operand")
                    })?;

For anyone more knowledgeable, does this seem to be correct?

[jedel1043]

It is correct, but I would very much prefer if we moved the error to the parser.

[veera-sivarajan]

Hi, can I work on this issue?

[jedel1043]

@veera-sivarajan Seems like @e-codes-stuff was checking out the issue, so maybe they have some WIP fix?

[e-codes-stuff]

No WIP fix here aside from the code I posted above which just adds a method call to something that should be moved into the parser

[addisoncrump]

With this fixed, there are currently no bugs found by the fuzzer with implied oracles. Huzzah!