E103: Turf found something it didn't expect here

This is the “that doesn’t belong there” error: Turf was in the middle of reading something and ran into a token that can’t legally appear at this spot. It names the token, so start by looking at it.

The usual causes:

• A value or operand that was left out:

  mut x: int = ;  mut y: int = 5 + ;

• An extra ; right after something that has already ended, such as a loop:

  do { x = x - 1; } while (x > 0);;       // the second ; has nothing to end

• A keyword where a value was expected – if, while and friends are statements, not values:

  mut x: int = while;

• A stray character that isn’t part of Turf, or an @ that isn’t @caller_location (the only decorator Turf has).

• A declaration keyword in the wrong place. A top-level mut x: int = 5; outside any function is not a declaration Turf accepts: variables live inside functions (a constant you want to share across files is export immut).

Delete the stray token, or add what was supposed to be there, and the error goes away. If the highlighted spot looks fine, check the line just above it: an unclosed bracket earlier on is often what makes a later, perfectly good token look wrong.

Run turf --explain E103 in a terminal to read this again.