The code you wrote is using a generic value, but it is not itself generic.
There is only one instantiated version of the runInt() function, and it
knows (at compile-time!) that mySet is an map[int]int.
Make that function actually generic - something like:
func testThing[K comparable, V any](m map[K]V) {
if m[1337] == 1337 {
print("OK")
} else {
print("nope")
}
}
and you get
./prog.go:xx:yy: cannot use 1337 (untyped int constant) as K value in map
index
./prog.go:xx:yy: cannot convert 1337 (untyped int constant) to V
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