flow_draw() should only be used in the debugger triggered by a call
flow_run(), or following a call to
d is an active binding to
flow_draw(), it means you can just type
(without parentheses) instead of
d was designed to look like the other shortcuts detailed in
c etc... It differs however in that it can be overridden.
For instance if the function uses a variable
d or that a parent environment
contains a variable
flow::d won't be found. In that case you will
have to use
flow_draw() are called outside of the debugger they will return
NULL invisibly (called for side effects)
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