What ascii values of characters are being used for this implementation of BF? Does not seem to be the same as that for some other online interpreters I've found..

Edit: I see my error.. My follow-up question: do integers in tests have leading zeroes?

I had a dream that somebody told me "You shouldn't try and write Brainfuck programs without a visualiser!". So I did this with a visualiser and it really did help with getting the loops right.

Me

Oh? Who approved it?

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It looks like it, yes.

Is it resolved now?

As discussed on Discord, leading zeroes are valid for numerical literals. My rust translation (above) adds this information to the description.

Rust translation ready for review.

Note: it updates the description.

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The description doesn't clearly specify whether 01 (number with leading 0) is considered a valid numeric literal or not. Python translation will consider f(01) a valid function expression, although based on test generation, it isn't really meant to.

Python sample tests do not use the new test framework.

Python test coverage is insufficient; it allows solutions which naively interpret an expression like "{1a}{1a}" as lambdas with 2 names (1, a) to pass, instead of rejecting the input as having an invalid name/number as per the spec.

I can read that sentence over and over and still get mind-f*cked

Because the map is laid out as rows of columns, R increases and L decreases the outer ( first ) coordinate, and D increases and U decreases the inner ( second ) coordinate. The first example shows the path True -> True -> True.