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Code Issues 1 Releases Wiki Activity

Address #1076 - unexpected shadowing behavior

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While the old behavior was reasonable, it is not spelled out anywhere
in the documentation and was incidental rather than intentional.
Parameters of the same name of the function should probably take
precedence on name collision, following the principle of least surprise.
This commit is contained in:
Calvin Rose 2023-03-12 10:30:59 -05:00
parent 3563f8ccdb
commit 1c6fda1a5c
1 changed files with 19 additions and 5 deletions
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24
src/core/specials.c
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@ -958,12 +958,26 @@ static JanetSlot janetc_fn(JanetFopts opts, int32_t argn, const Janet *argv) {
max_arity = (vararg || allow_extra) ? INT32_MAX : arity; max_arity = (vararg || allow_extra) ? INT32_MAX : arity;
if (!seenopt) min_arity = arity; if (!seenopt) min_arity = arity;
/* Check for self ref */ /* Check for self ref (also avoid if arguments shadow own name) */
if (selfref) { if (selfref) {
JanetSlot slot = janetc_farslot(c); /* Check if the parameters shadow the function name. If so, don't
slot.flags = JANET_SLOT_NAMED | JANET_FUNCTION; * emit JOP_LOAD_SELF and add a binding since that most users
janetc_emit_s(c, JOP_LOAD_SELF, slot, 1); * seem to expect that function parameters take precedence over the
janetc_nameslot(c, janet_unwrap_symbol(head), slot); * function name */
const uint8_t *sym = janet_unwrap_symbol(head);
int32_t len = janet_v_count(c->scope->syms);
int found = 0;
for (int32_t i = 0; i < len; i++) {
if (c->scope->syms[i].sym == sym) {
found = 1;
}
}
if (!found) {
JanetSlot slot = janetc_farslot(c);
slot.flags = JANET_SLOT_NAMED | JANET_FUNCTION;
janetc_emit_s(c, JOP_LOAD_SELF, slot, 1);
janetc_nameslot(c, sym, slot);
}
} }
/* Compile function body */ /* Compile function body */