When reading/reviewing someone else's code you have to know the entire set of problems and constraints that may arise from their code, including syntax traps, s

When reading/reviewing someone else's code you have to know the entire set of problems and constraints that may arise from their code, including syntax traps, semantic esoterica, and effects. You can't simply decide on a subset of the language that you like and declare than none of the rest of it affects the code unless you want to trust that none of the excluded set has any impact.