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package d
type message interface{ PR() }
func noparam() {
var messageT message
messageT.PR() // want "nil dereference in dynamic method call"
}
func paramNonnil[T message]() {
var messageT T
messageT.PR() // cannot conclude messageT is nil.
}
func instance() {
// buildssa.BuilderMode does not include InstantiateGenerics.
paramNonnil[message]() // no warning is expected as param[message] id not built.
}
func param[T interface {
message
~*int | ~chan int
}]() {
var messageT T // messageT is nil.
messageT.PR() // nil receiver may be okay. See param[nilMsg].
}
type nilMsg chan int
func (m nilMsg) PR() {
if m == nil {
print("not an error")
}
}
var G func() = param[nilMsg] // no warning
func allNillable[T ~*int | ~chan int]() {
var x, y T // both are nillable and are nil.
if x != y { // want "impossible condition: nil != nil"
print("unreachable")
}
}
func notAll[T ~*int | ~chan int | ~int]() {
var x, y T // neither are nillable due to ~int
if x != y { // no warning
print("unreachable")
}
}
func noninvoke[T ~func()]() {
var x T
x() // want "nil dereference in dynamic function call"
}
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