panic: Scope location 47 must be greater than 84

[programmeruser2]

I was working on my discord bot on repl.it, and it appears that upm invoked this package which apparently has a bug.
Here are the logs:

 panic: Scope location 47 must be greater than 84 [recovered]
    panic: Scope location 47 must be greater than 84

goroutine 19 [running]:
github.com/amasad/esparse/parser.Parse.func1(0xc000103e58)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:7827 +0x6a
panic(0x883dc0, 0xc000198030)
    /usr/lib/go-1.15/src/runtime/panic.go:969 +0x1b9
github.com/amasad/esparse/parser.(*parser).pushScopeForParsePass(0xc0001a6000, 0x2, 0x2f, 0x2)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:272 +0x39f
github.com/amasad/esparse/parser.(*parser).parseParenExpr(0xc0001a6000, 0x2f, 0x0, 0x0, 0x0)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:1759 +0x6ab
github.com/amasad/esparse/parser.(*parser).parsePrefix(0xc0001a6000, 0x3, 0x0, 0xc000000000, 0x0, 0x0)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:1915 +0x14e9
github.com/amasad/esparse/parser.(*parser).parseExpr(0xc0001a6000, 0x3, 0x82231101, 0xc0000d1158, 0x778474)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:2435 +0x45
github.com/amasad/esparse/parser.(*parser).parseSuffix(0xc0001a6000, 0x1e, 0x10d14a0, 0xc000180270, 0x0, 0x0, 0x8debc0, 0xc0001a6001, 0xc000194120)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:2872 +0x3825
github.com/amasad/esparse/parser.(*parser).parseExpr(0xc0001a6000, 0x0, 0x1, 0x1, 0x1)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:2435 +0x85
github.com/amasad/esparse/parser.(*parser).parseStmt(0xc0001a6000, 0x101, 0x0, 0x0, 0x0)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:4592 +0x110
github.com/amasad/esparse/parser.(*parser).parseStmtsUpTo(0xc0001a6000, 0x0, 0x101, 0x27, 0xc000196120, 0x27)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:4834 +0xa8
github.com/amasad/esparse/parser.Parse(0xc000182060, 0x1, 0xc000196120, 0x27, 0xc000196120, 0x27, 0xc0001a2000, 0xdf, 0x1, 0x0, ...)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:7851 +0x1d0
github.com/replit/upm/internal/backends/nodejs.parseFile(0x1, 0xc000196120, 0x27, 0xc000196120, 0x27, 0xc0001a2000, 0xdf, 0xc000182000)
    /upm/internal/backends/nodejs/grab.go:86 +0x158
created by github.com/replit/upm/internal/backends/nodejs.guessBareImports.func1
    /upm/internal/backends/nodejs/grab.go:136 +0x431

panic: Scope location 47 must be greater than 84 [recovered]
    panic: Scope location 47 must be greater than 84

goroutine 7 [running]:
github.com/amasad/esparse/parser.Parse.func1(0xc0000f9e58)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:7827 +0x6a
panic(0x883dc0, 0xc0000576c0)
    /usr/lib/go-1.15/src/runtime/panic.go:969 +0x1b9
github.com/amasad/esparse/parser.(*parser).pushScopeForParsePass(0xc0000b6580, 0x2, 0x2f, 0x2)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:272 +0x39f
github.com/amasad/esparse/parser.(*parser).parseParenExpr(0xc0000b6580, 0x2f, 0x0, 0x0, 0x0)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:1759 +0x6ab
github.com/amasad/esparse/parser.(*parser).parsePrefix(0xc0000b6580, 0x3, 0x0, 0xc000000000, 0x0, 0x0)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:1915 +0x14e9
github.com/amasad/esparse/parser.(*parser).parseExpr(0xc0000b6580, 0x3, 0xec6d00bb, 0xc0000cd158, 0x778474)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:2435 +0x45
github.com/amasad/esparse/parser.(*parser).parseSuffix(0xc0000b6580, 0x1e, 0x10d14a0, 0xc0001285d0, 0x0, 0x0, 0x8debc0, 0xc0000b6501, 0xc00000f100)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:2872 +0x3825
github.com/amasad/esparse/parser.(*parser).parseExpr(0xc0000b6580, 0x0, 0x1, 0x1, 0x1)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:2435 +0x85
github.com/amasad/esparse/parser.(*parser).parseStmt(0xc0000b6580, 0x101, 0x0, 0x0, 0x0)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:4592 +0x110
github.com/amasad/esparse/parser.(*parser).parseStmtsUpTo(0xc0000b6580, 0x0, 0x101, 0x27, 0xc00002c180, 0x27)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:4834 +0xa8
github.com/amasad/esparse/parser.Parse(0xc000026240, 0x1, 0xc00002c180, 0x27, 0xc00002c180, 0x27, 0xc0000b0380, 0xdf, 0x1, 0x0, ...)
    /root/go/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:7851 +0x1d0
github.com/replit/upm/internal/backends/nodejs.parseFile(0x1, 0xc00002c180, 0x27, 0xc00002c180, 0x27, 0xc0000b0380, 0xdf, 0xc0000261e0)
    /upm/internal/backends/nodejs/grab.go:86 +0x158
created by github.com/replit/upm/internal/backends/nodejs.guessBareImports.func1
    /upm/internal/backends/nodejs/grab.go:136 +0x431

[amasad]

Interesting, do you know which package is causing this?

[Obaida-Albaroudi]

@programmeruser2 Hi! Just looked into this for you and it looks like there was an issue with the .replit file. If you add a closing quotation at the end of the run command it should work. I attached a screenshot of how I got my fork to work as well as my forked repl.

My repl:

• https://replit.com/@obaidaa/language-bot#.replit

[programmeruser2]

@Obaida-Albaroudi Yes, it does work if you tell the packager to ignore the current directory, which is functionally equivalent to turning it off. The bug still persists if you don't.

[cherryblossom000]

I'm having the same error, but I'm not sure if it's the same bug.

I've narrowed it down to a minimal example (playground):

package main

import (
	"github.com/amasad/esparse/logging"
	"github.com/amasad/esparse/parser"
)

func main() {
	logger, _ := logging.NewStderrLog(logging.StderrOptions{})
	path := "file.js"
	parser.Parse(logger, logging.Source{
		Index:        0,
		AbsolutePath: path,
		PrettyPath:   path,
		Contents:     `(a = () => {}) => {}`,
	}, parser.ParseOptions{})
}

This outputs:

panic: Scope location 0 must be greater than 5 [recovered]
	panic: Scope location 0 must be greater than 5

goroutine 1 [running]:
github.com/amasad/esparse/parser.Parse.func1(0xc000191f38)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:7827 +0x6b
panic(0x51bd60, 0xc0000102c0)
	/usr/local/go-faketime/src/runtime/panic.go:965 +0x1b9
github.com/amasad/esparse/parser.(*parser).pushScopeForParsePass(0xc000188000, 0x2, 0x0, 0x0)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:272 +0x39f
github.com/amasad/esparse/parser.(*parser).parseParenExpr(0xc000188000, 0x0, 0x0, 0x0, 0x0)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:1759 +0x6c5
github.com/amasad/esparse/parser.(*parser).parsePrefix(0xc000188000, 0x0, 0x0, 0x7f7500000000, 0x0, 0x0)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:1915 +0x15cf
github.com/amasad/esparse/parser.(*parser).parseExpr(0xc000188000, 0x0, 0x400, 0x30, 0x7f7569803e00)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:2435 +0x45
github.com/amasad/esparse/parser.(*parser).parseStmt(0xc000188000, 0x101, 0x0, 0x0, 0x0)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:4592 +0x110
github.com/amasad/esparse/parser.(*parser).parseStmtsUpTo(0xc000188000, 0x0, 0x101, 0x7, 0x541f14, 0x7)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:4834 +0xa6
github.com/amasad/esparse/parser.Parse(0xc0000620c0, 0x0, 0x541f14, 0x7, 0x541f14, 0x7, 0x5445b8, 0x14, 0x0, 0x0, ...)
	/tmp/gopath258687768/pkg/mod/github.com/amasad/[email protected]/parser/parser.go:7851 +0x1d0
main.main()
	/tmp/sandbox989750109/prog.go:11 +0x125

Program exited: status 2.

I think it's having trouble with an arrow function as the default parameter of another arrow function.

I would try and fix this and open a PR, but I have absolutely no experience with Go.