#!stacks
"runtime.sigpanic" && ("golang.hover:+170" || "golang.hover:+209" || "golang.hover:+216")

This stack zUGLQA was reported by telemetry:

if def, ok := pkg.TypesInfo().Defs[ident]; ok && ident.Pos() == def.Pos() {

Looks like Defs[ident]=nil is an actual map entry. This is confirmed by #69362 (comment).

crash/crash
runtime.gopanic:+69
runtime.panicmem:=262
runtime.sigpanic:+19
golang.org/x/tools/gopls/internal/golang.hover:+170
golang.org/x/tools/gopls/internal/golang.Hover:+4
golang.org/x/tools/gopls/internal/server.(*server).Hover:+30
golang.org/x/tools/gopls/internal/protocol.serverDispatch:+335
golang.org/x/tools/gopls/internal/lsprpc.(*streamServer).ServeStream.ServerHandler.func3:+5
golang.org/x/tools/gopls/internal/lsprpc.(*streamServer).ServeStream.handshaker.func4:+52
golang.org/x/tools/gopls/internal/protocol.Handlers.MustReplyHandler.func1:+2
golang.org/x/tools/gopls/internal/protocol.Handlers.AsyncHandler.func2.2:+3
runtime.goexit:+0

golang.org/x/tools/gopls@v0.16.1 go1.23.0 darwin/amd64 vscode (1)

Issue created by golang.org/x/tools/gopls/internal/telemetry/cmd/stacks.
Dups: ylB3Iw x2v5eg v95MAw r1YMdg