Trim leading whitespace from contextual error, detect EOF

Side-note that the token location tuple maintains the correct column
number to include the whitespace in the source file. Side-side note:
tabs are counted as one column but many editors will count them as
whatever the tabstop/tabwidth is.

1 files changed, 1 insertions, 0 deletions

diff --git a/lexer.h b/lexer.h
index 2e27ffa..3ce15f4 100644
--- a/lexer.h
+++ b/lexer.h
@@ -19,6 +19,7 @@ enum TOKEN_TYPE {
 struct location {
 	size_t line;
 	size_t column;
+	size_t leading_whitespace_len;
 };
 
 struct token {