diff options
Diffstat (limited to 'src/textprop.c')
| -rw-r--r-- | src/textprop.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/textprop.c b/src/textprop.c index a473bebeab6..cd07484204b 100644 --- a/src/textprop.c +++ b/src/textprop.c @@ -1303,7 +1303,8 @@ set_text_properties (start, end, properties, object, signal_after_change_p) properties PROPERTIES. BUFFER is the buffer containing the text. This does not obey any hooks. You can provide the interval that START is located in as I, - or pass NULL for I and this function will find it. */ + or pass NULL for I and this function will find it. + This function assumes that START < END. */ void set_text_properties_1 (start, end, properties, buffer, i) @@ -1316,6 +1317,7 @@ set_text_properties_1 (start, end, properties, buffer, i) s = XINT (start); len = XINT (end) - s; + eassert (len > 0); if (i == 0) i = find_interval (BUF_INTERVALS (XBUFFER (buffer)), s); |