I have a drracket plugin that reads the contents of the definitions window as syntax and then traverses that syntax object so that for each subexpression e it prints 1) (syntax->datum e), and 2) the contents of the definitions window at starting at position (syntax-position e) and ending at (syntax-position e) + (syntax-span e)
I would expect each subexpression in the program to be printed twice and the plugin generally works as expected, except when I use the unicode lambda character. For example, if I have the program: #lang racket (add1 10) the (add1 10) syntax object correctly has position 14 and span 9 and the add1 syntax object correctly has position 15 and span 4. But for the program: #lang racket (λ (x) x) the (λ (x) x) syntax object has position 14 but span 11 (2 more than expected) and the λ syntax object has position 17 (again, 2 more than expected) Has anyone seen this behavior before? I'll try to distill my plugin to get something reproducible if it's not obvious what's going on. (I think that syntax positions start at 0 and editor positions start at 1 but I account for that so that's not the cause of the problem.) (I'm also aware that evaluating (syntax-span #'(λ (x) x)) in the repl correctly produces 9 so I don't know what's going on.) _________________________ Racket Developers list: http://lists.racket-lang.org/dev
