-> at the beginning of the line makes the linter crash

[robertoaloi]

The following code:

-spec wait_for_fun(term(), non_neg_integer(), non_neg_integer())
-> {ok, any()} | ok | timeout.

Causes the linter to fail with:

# apps/els_dap/test/els_dap_test_utils.erl [FAIL]
Error: 'function_clause' while applying rule 'operator_spaces'.

Moving the -> away from the beginning of the line solves the issue.

[paulo-ferraz-oliveira]

Issue is in this function:

-spec character_at_location(Position::atom(),
                            Lines::[binary()],
                            Operator::string(),
                            Location::{integer(), integer()},
                            Encoding::latin1|utf8) -> char().
character_at_location(Position, Lines, Operator, {LineNo, Col}, Encoding) ->
    Line = lists:nth(LineNo, Lines),
    OperatorLineStr = unicode:characters_to_list(Line, Encoding),
    ColToCheck = case Position of
        left  -> Col - 1;
        right -> Col + length(Operator)
    end,
    % If ColToCheck is greater than the length of OperatorLineStr variable, it
    % means the end of line was reached so return " " to make the check pass,
    % otherwise return the character at the given column.
    % NOTE: text below only applies when the given Position is equal to `right`.
    SpaceChar = $\s,
    case {Position, (ColToCheck > length(OperatorLineStr))} of
        {right, true}  -> SpaceChar;
        _ -> lists:nth(ColToCheck, OperatorLineStr)
    end.

I'll try to fix soon.