Comment 2 for bug 921900

StacktraceTop:
 operator() (base=0x7f2b2b9f154c, this=<synthetic pointer>) at /build/buildd/pango1.0-1.29.4/./pango/opentype/hb-open-type-private.hh:456
 operator+<const RecordListOf<Script>*, USHORT, Script> (offset=<optimized out>, base=<optimized out>) at /build/buildd/pango1.0-1.29.4/./pango/opentype/hb-open-type-private.hh:483
 operator[] (this=0x7f2b2b9f154c, i=0) at /build/buildd/pango1.0-1.29.4/./pango/opentype/hb-ot-layout-common-private.hh:109
 get_script (i=0, this=<optimized out>) at /build/buildd/pango1.0-1.29.4/./pango/opentype/hb-ot-layout-gsubgpos-private.hh:915
 hb_ot_layout_language_get_feature_indexes (face=<optimized out>, table_tag=<optimized out>, script_index=0, language_index=3618181052, feature_count=0x7fffd7a90010, feature_indexes=0x27def20) at /build/buildd/pango1.0-1.29.4/./pango/opentype/hb-ot-layout.cc:446