if self.nesting == 0 {

// Determine indent or dedent:

let current_indentation = self.indentation_stack.last().unwrap();

let ordering = indentation_level.compare_strict(current_indentation, self.get_pos())?;

match ordering {

Ordering::Equal => {

// Same same

}

Ordering::Greater => {

// New indentation level:

self.indentation_stack.push(indentation_level);

let tok_pos = self.get_pos();

self.emit((tok_pos, Tok::Indent, tok_pos));

}

Ordering::Less => {

// One or more dedentations

// Pop off other levels until col is found:

loop {

let current_indentation = self.indentation_stack.last().unwrap();

let ordering = indentation_level

.compare_strict(current_indentation, self.get_pos())?;

match ordering {

Ordering::Less => {

self.indentation_stack.pop();

let tok_pos = self.get_pos();

self.emit((tok_pos, Tok::Dedent, tok_pos));

}

Ordering::Equal => {

// We arrived at proper level of indentation.

break;

}

Ordering::Greater => {

return Err(LexicalError {

error: LexicalErrorType::IndentationError,

location: self.get_pos(),

});

}