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**You can use an Option to keep track of the mutable state between iterations.**
**Use as_mut to get a mutable reference to the Option's inner value without consuming the Option.**
**Use unwrap on the mutable reference to access the inner value.**
_See this code just for reference_
~~`let mut sections: Vec<Section> = Vec::new();~~
let mut current_section: Option<Section> = None;
for line in read_to_string("input.ini").unwrap().lines() {
if line.trim().ends_with("]") {
if let Some(section) = current_section.take() {
sections.push(section);
}
current_section = Some(Section::new(line));
} else {
current_section.as_mut().unwrap().add_entry(line);
}
}
if let Some(section) = current_section {
sections.push(section);
}`

**You can use an Option to keep track of the mutable state between iterations.**
**Use as_mut to get a mutable reference to the Option's inner value without consuming the Option.**
**Use unwrap on the mutable reference to access the inner value.**
_See this code just for reference_
```rust
let mut sections: Vec<Section> = Vec::new();
let mut current_section: Option<Section> = None;
for line in read_to_string("input.ini").unwrap().lines() {
if line.trim().ends_with("]") {
if let Some(section) = current_section.take() {
sections.push(section);
}
current_section = Some(Section::new(line));
} else {
current_section.as_mut().unwrap().add_entry(line);
}
}
if let Some(section) = current_section {
sections.push(section);
}
```

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