env RYE_FLOW=1 to show line numbers of commands executed
case []P for ShowP.
typo: "and" is not "or".
Aborted ParseTarget() -- wrong approach.
A couple of comments to tr.py
factor out AssignAFromB
destructuring assignment in Tassign
destructure "for" vars in parens
destructure "for" vars properly
for expressions (list interpolation)
Print stack when exception recovered. Reflect improvements.