http.Serve stack printed only after 2nd panic

[agukrapo]

env

go version go1.24.0 darwin/arm64 fish, version 4.0.0 panicparse v2.4.0

steps to reproduce

setup a server like this

package main

import (
	"log"
	"net/http"
	"regexp"
)

func main() {
	s := &http.Server{Addr: ":8888", Handler: http.HandlerFunc(handle)}
	log.Fatal(s.ListenAndServe())
}

func handle(http.ResponseWriter, *http.Request) {
	regexp.MustCompile("p([a-z]+ch")
}

launch the server with go run . &| pp

in other console execute curl localhost:8888

then the server only prints

2025/03/01 20:16:26 http: panic serving [::1]:50210: regexp: Compile(`p([a-z]+ch`): error parsing regexp: missing closing ): `p([a-z]+ch`

if we execute curl again only then we get the 1st parsed panic followed by the 2nd "http: panic serving" log without stack

To see all goroutines, visit https://github.com/maruel/panicparse#gotraceback

1: running [Created by http.(*Server).Serve in goroutine 1 @ server.go:3454]
    http   server.go:1947 (*conn).serve.func1()
           panic.go:787   panic(any{0x1006a8180, 0x1400009e2e0})
    regexp regexp.go:313  MustCompile(string(0x10061742e, len=10))
    main   main.go:15     handle(ResponseWriter{0x140000fdb78, 0x1005b216c}, *Request(0x1400009a128))
    http   server.go:2294 HandlerFunc.ServeHTTP(ResponseWriter(0x0), *Request(#2), 0x140000fdb60)
    http   server.go:3301 serverHandler.ServeHTTP(ResponseWriter{0x140000a3200}, *Request(#1), #2, 0x1)
    http   server.go:2102 (*conn).serve(*conn(0x140000de240), Context{0x10070f0a8, 0x140000a3110})
2025/03/01 20:18:03 http: panic serving [::1]:50212: regexp: Compile(`p([a-z]+ch`): error parsing regexp: missing closing ): `p([a-z]+ch`