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# Semi Structured Logs
Welcome to Semi Structured Logs on Exercism's Rust Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
## Introduction
Enums, short for enumerations, are a type that limits all possible values of some data. The possible values of an `enum` are called variants. Enums also work well with `match` and other control flow operators to help you express intent in your Rust programs.
## Instructions
In this exercise you'll be generating semi-structured log messages.
## 1. Emit semi-structured messages
You'll start with some stubbed functions and the following enum:
```rust
#[derive(Clone, PartialEq, Debug)]
pub enum LogLevel {
Info,
Warning,
Error,
}
```
Your goal is to emit a log message as follows: `"[<LEVEL>]: <MESSAGE>"`.
You'll need to implement functions that correspond with log levels.
For example, the below snippet demonstrates an expected output for the `log` function.
```rust
log(LogLevel::Error, "Stack overflow")
// Returns: "[ERROR]: Stack overflow"
```
And for `info`:
```rust
info("Timezone changed")
// Returns: "[INFO]: Timezone changed"
```
Have fun!
## 2. Optional further practice
There is a feature-gated test in this suite.
Feature gates disable compilation entirely for certain sections of your program.
They will be covered later.
For now just know that there is a test which is only built and run when you use a special testing invocation:
```sh
cargo test --features add-a-variant
```
This test is meant to show you how to add a variant to your enum.
## Source
### Created by
- @efx
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