Literal bytes >=128: b"\x80"

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
javascript, python
Domain
compilers

Research direction

Start by reproducing the examples in x.py with python -m transcrypt -b -m x.py, comparing byte literals at and above 128 with the working cases. Then inspect the compiler and minifier entry points reached by that command, using the generated x.js and reported parse error as the failure signal. Done means the affected examples compile successfully without the shown errors.

Written by the indexing model from the issue text.

Description

IS: enhancement STATE: postponed

This is broken:

x = b"\x80"

$ python -m transcrypt -b -m  x.py
Error while compiling (offending file last):
        File 'x', line 1, namely:
        
        Error while compiling (offending file last):
        File 'x', line 1, namely:
        

Aborted

b"\x81" is also broken, while b"\x7F" works fine.

This workaround compiles with the -n flag, but breaks when minified:

x = (0x80).to_bytes(1, "big")

$ python -m transcrypt -b -m  x.py
Saving minified target code in: /Users/crusaderky/PycharmProjects/10char/__target__/x.js
x.pretty.js:4: ERROR - Parse error. Semi-colon expected
export var x = 128.to_bytes (1, 'big');
                   ^

This compiles (but I didn't test yet if it actually runs):

x = 0x80
y = x.to_bytes(1, "big")

This also compiles:

x = chr(0x80)
Dominant language
Python
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