""} is invalid syntax, and while running it, Ripper tries to run on_embexpr_end to try and handle it as if it were the closing brace of an embexpr. However, in that case, we get a NoMethodError for trying to append to an array that isn't there (since we didn't call on_embexpr_beg. This is absolutely a weird edge case, but handling it means we correctly report this as a syntax error instead of an internal ruby error.
(There might be something to do here for a more sustainable solution, which is something like if we run into an internal ruby error, call the parser directly without rubyfmt_lib and see if it parses correctly, but I'll leave that as an idea for a later day.)
""}is invalid syntax, and while running it, Ripper tries to runon_embexpr_endto try and handle it as if it were the closing brace of an embexpr. However, in that case, we get aNoMethodErrorfor trying to append to an array that isn't there (since we didn't callon_embexpr_beg. This is absolutely a weird edge case, but handling it means we correctly report this as a syntax error instead of an internal ruby error.(There might be something to do here for a more sustainable solution, which is something like if we run into an internal ruby error, call the parser directly without
rubyfmt_liband see if it parses correctly, but I'll leave that as an idea for a later day.)