Only consider StartColumn on first line

Author: josevalim

lib/elixir/src/elixir_errors.erl

@@ -88,7 +88,8 @@ snippet(InputString, Location, StartLine, StartColumn) ->
     {column, Column} ->
       Lines = string:split(InputString, "\n", all),
       Snippet = elixir_utils:characters_to_binary(lists:nth(Line - StartLine + 1, Lines)),
-      #{content => Snippet, offset => (Column - StartColumn)};
+      Offset = if Line == StartLine -> Column - StartColumn; true -> Column - 1 end,
+      #{content => Snippet, offset => Offset};
 
     false ->
       nil

lib/elixir/test/elixir/code_test.exs

@@ -158,6 +158,12 @@ defmodule CodeTest do
     assert_raise SyntaxError, message, fn ->
       Code.string_to_quoted!("1 + * 3", line: 10, column: 3)
     end
+
+    message = "nofile:11:5: syntax error before: '*'\n    |\n 11 | 1 + * 3\n    |     ^"
+
+    assert_raise SyntaxError, message, fn ->
+      Code.string_to_quoted!(":ok\n1 + * 3", line: 10, column: 3)
+    end
   end
 
   test "compile source" do