"static" ignores dynamic calls altogether.
"cha" uses Class Hierarchy Analysis, which assumes that a
dynamic call may dispatch to any func or method that satisfies
the type.
Both these algorithms can work on partial programs,
e.g. libraries without a main function or tests.
(This feature was requested after my talk last night.)
+ Tests.
LGTM=sameer
R=sameer, minux
CC=golang-codereviews, gri
https://golang.org/cl/176780043