macro
boot.janet on line 2858 , column 1
(compwhen cnd & body )
Check the condition `cnd` at compile time -- if truthy , compile
`(upscope ;body)` , else compile nil.
# If your tooling or the compiler doesn't believe a symbol will be bound e.g.:
(def a b ) # if b e.g. gets bound by some macro or pushed directly to the env
# You can wrap it with compwhen on a bool:
(var- bla false )
(compwhen bla
(def a b ))
# Whatever defines b should then set bla to true
# From: https://codeberg.org/veqq/declarative-dsls/src/branch/master/src/declarative-dsls/logic.janet