nitc :: Location :: _column_start
line_startA column_start of 1 means the first column or character.
If column_start == 0 this location concerns the whole line.
Require: column_start >= 0
# Start of this location on `line_start`
#
# A `column_start` of 1 means the first column or character.
#
# If `column_start == 0` this location concerns the whole line.
#
# Require: `column_start >= 0`
var column_start: Int
src/location.nit:82,2--89,22