diff options
Diffstat (limited to 'core/module.c')
| -rw-r--r-- | core/module.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/core/module.c b/core/module.c index 621a510..3a6c4b5 100644 --- a/core/module.c +++ b/core/module.c @@ -3980,6 +3980,8 @@ static inline __attribute__((always_inline)) int step(Frame *frame, const PureOp } case PURE_OP_CONCAT: { PureBytes right = stack[--sp].bytes, left = stack[sp - 1].bytes; + if (!right.length) NEXT; /* joined with nothing: the other as it is, uncopied (values do not change) */ + if (!left.length) { stack[sp - 1].bytes = right; NEXT; } size_t start = arena->used; if ((status = append_value(app, arena, left)) != PURE_OK || (status = append_value(app, arena, right)) != PURE_OK) STOPPED(status); |