## my_rule
my_rule(name, deps, extra_arguments, out, src, tool)
This rule exercises some of the build API. ### Attributes
name String; required

A unique name for this rule.

deps List of labels; optional

A list of dependencies. These dependencies better provide MyInfo! ...or else.

extra_arguments List of strings; optional
out Label; required

The output file.

src Label; optional

The source file.

tool Label; optional

The location of the tool to use.