panics | Simple package to catch & notify your panic or exceptions | Chat library

This is simply because std::ops::RangeFrom is defined to be "bounded inclusively below".

A quick recap of all the plumbing: v[4..] desugars to std::ops::Index using 4.. (which parses as a std::ops::RangeFrom) as the parameter. std::ops::RangeFrom implements std::slice::SliceIndex and Vec has an implementation for std::ops::Index for any parameter that implements std::slice::SliceIndex. So what you are looking at is a RangeFrom being used to std::ops::Index the Vec.

std::ops::RangeFrom is defined to always be inclusive on the lower bound. For example [0..] will include the first element of the thing being indexed. If (in your case) the Vec is empty, then [0..] will be the empty slice. Notice: if the lower bound wasn't inclusive, there would be no way to slice an empty Vec at all without causing a panic, which would be cumbersome.

A simple way to think about it is "where the fence-post is put".

A v[0..] in a vec![0, 1, 2 ,3] is

Credit to a comment by EvilTak.

glam has a method to_col_array() that returns the data in the Mat4.

issue solved by changing:

you need to assign the type casted value t instead of d

I mean, that's the real solution: you must avoid panics, not try to recover from them when they happen.

Some languages casually use exceptions to deal with conditions preventing some operations, and manage them without crashing. In Rust, those unsupported conditions are managed with errors, not panics.

A panic in Rust is

• most often a bug, usually temporary because you've put an unwrap in your first prototyping
• or a very extraordinary condition

When a crate you use panics, first check you're using the function as expected (and if you can't check that without panicking that's a bug in that lib), then either have it fixed or fix it yourself if you can.

There's no reasonable way to deal with a casual panic, apart from crashing as fast as possible. A panic isn't casual in the life of your program.

Before diving into your solution and its issues, let me recommend again another Broker approach presented in this answer: How to broadcast message using channel

Now on to your solution.

Whenever you launch a goroutine, always think of how it will end and make sure it does if the goroutine is not ought to run for the lifetime of your app.

Need to make a pointer to struct instead of a value and pass pointer's value, which can by retrieved Interface() function, to Unmarshal instead of it itself.

Looking a the bug tracker, I found IP is not recognized in RTSP url.

The answer is apparently that url follows / implements the URL Standard (which makes sense as it was developed in the context of Servo), and the URL Standard only requires IPv4 address recognition of a select number of schemes because those schemes (apparently) handle IPv4 addresses specially: https://github.com/servo/rust-url/issues/577

Specifically: the special schemes are ftp, http, https, ws, wss (there's also file but it's its own category), and the differences in host representation are that:

• a special scheme's host can be ipv4, ipv6, or domain
• a non-special scheme's host can be ipv6, opaque, empty, or null

url will in fact parse ipv6 for non-special schemes, though everything else it just dumps into Some(Domain(...)) (or None).

Anyway this means that if you get a Domain result, you probably want to try and parse it as an IP.

Incidentally, you don't have to format! to format your panic messages, panic! will do that internally.

This code works:

The problem is you either have a small misconception about what value_name (which is used only for the CLI help option) is, or you missed, that the argument names are case sensitive.

You have two options to make this work as expected:

1. Use the lowercase argument name as specified in the YAML (change .rs):

YAML: