Cannot move out of borrowed content

Cannot move out of borrowed content

I don't understand the error cannot move out of borrowed content. I have received it many times and I have always solved it, but I've never understood why.

I don't understand the error cannot move out of borrowed content. I have received it many times and I have always solved it, but I've never understood why.

For example:

for line in self.xslg_file.iter() {
    self.buffer.clear();

for current_char in line.into_bytes().iter() {
    self.buffer.push(*current_char as char);
}

println!("{}", line);

}

produces the error:

error[E0507]: cannot move out of borrowed content
  --> src/main.rs:31:33
   |
31 |             for current_char in line.into_bytes().iter() {
   |                                 ^^^^ cannot move out of borrowed content

I solved it by cloning line:

for current_char in line.clone().into_bytes().iter() {

I don't understand the error even after reading other posts like:

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