[BUG] Process hang

[secsys-go]

Describe the bug
We used the Fuzz engine to modify some Test(TestUseRouterParentDisallow) data, and then we encountered process hang. We hope to get the help of the developer to confirm whether it is a real bug.

To Reproduce

app := iris.New()
app.PartyFunc("{0h0", func(p iris.Party) {
	p.UseRouter(func(ctx iris.Context) {
		ctx.WriteString("0")
		ctx.Next()
	})

	p.Get("(o}\x10\x00}", func(ctx iris.Context) {
		ctx.WriteString("0")
	})
})

Expected behavior
Process hang should not happen.

Desktop (please complete the following information):

• OS: Windows 10

iris.Version

• commit 28f49cd

[fubuki8087]

I try to fix this bug. I debugged it and found the root cause of this bug was derived from readIdentifierFuncArgument function in macro/interpreter/lexer/lexer.go where reading input will not end because of lacking end check of string. I will submit PR later.