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SA1019: "unsupported selector" panic on generic struct literal with deprecated field #1821
Description
What happened
SA1019 panics with unsupported selector when a composite literal of an
instantiated generic struct sets a deprecated field.
This only happens when the literal is in a different package than the struct
type, because SA1019 doesn't report uses inside the package that declares the
type.
Reproducer
-- go.mod --
module example.com/repro
go 1.27
-- a/a.go --
package a
type Params[T any] struct {
// Deprecated: use New instead.
Old string
New T
}
-- b/b.go --
package b
import "example.com/repro/a"
var _ = a.Params[int]{Old: "x"}
$ go run honnef.co/go/tools/cmd/staticcheck@v0.8.1 -checks SA1019 ./...
panic: unsupported selector: &{0x2211e9f2d6b0 Old}
goroutine 519 [running]:
honnef.co/go/tools/analysis/code.SelectorName(0x2211ea3dfc00, 0x2211ea24f2c0)
honnef.co/go/tools@v0.8.1/analysis/code/code.go:104 +0x454
honnef.co/go/tools/staticcheck/sa1019.run.func3(0x2211ea24f2c0)
honnef.co/go/tools@v0.8.1/staticcheck/sa1019/sa1019.go:156 +0x394If Params isn't generic, SA1019 reports Old as deprecated and doesn't
panic, so the panic only happens with instantiated generic types.
Versions
$ staticcheck -version
staticcheck 2026.2.1 (0.8.1)
$ go version
go version go1.27.1 linux/amd64GOOS=linux GOARCH=amd64. Also reproduces on master.
Activity
[-]SA1019: panic "unsupported selector" on composite literals of generic structs with deprecated fields[/-][+]SA1019: "unsupported selector" panic on generic struct literal with deprecated field[/+]analysis/code: handle selectors on instantiated generic types
analysis/code: handle selectors on instantiated generic types