py, unix: Allow to compile with -Wsign-compare.
See issue #699.
diff --git a/py/lexer.c b/py/lexer.c
index f4aedb4..13c3a3e 100644
--- a/py/lexer.c
+++ b/py/lexer.c
@@ -657,7 +657,7 @@
// need to check for this special token in many places in the compiler.
// TODO improve speed of these string comparisons
//for (mp_int_t i = 0; tok_kw[i] != NULL; i++) {
- for (mp_int_t i = 0; i < MP_ARRAY_SIZE(tok_kw); i++) {
+ for (size_t i = 0; i < MP_ARRAY_SIZE(tok_kw); i++) {
if (str_strn_equal(tok_kw[i], lex->vstr.buf, lex->vstr.len)) {
if (i == MP_ARRAY_SIZE(tok_kw) - 1) {
// tok_kw[MP_ARRAY_SIZE(tok_kw) - 1] == "__debug__"