In doing some typed/racket, I have noticed some mismatch between observed 
behavior and the documentation at

1) Documentation suggests that for/first and for/last should work, yet they 
seem to not type check.  I've noticed sparse comments to that effect since 

2) In working around for/first with for/fold, I discovered that #:break 
appears to function although the for loop documentation for typed racket 
(Section 2.3 in typed/racket reference) suggests that only the #:when guard 
is a keyword in the for/ family syntax. 

3) In the struct documentation for typed racket, the many for syntax 
keywords shown do not include #:guard, yet it seems to work.

Are #:break and #:guard correct to use in typed/racket or are they missing 
from the documentation intentionally?



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