src/location: support calling `colored_line` when `start_column == 0`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/src/location.nit b/src/location.nit
index 993ce7d..8ed4428 100644 (file)
--- a/src/location.nit
+++ b/src/location.nit
@@ -174,7 +174,12 @@ class Location
                while line_end+1 < string.length and string.chars[line_end+1] != '\n' and string.chars[line_end+1] != '\r' do
                        line_end += 1
                end
-               var lstart = string.substring(line_start, l.column_start - 1)
+               var lstart
+               if l.column_start > 0 then
+                       lstart = string.substring(line_start, l.column_start - 1)
+               else
+                       lstart = ""
+               end
                var cend
                if i != l.line_end then
                        cend = line_end - line_start + 1