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-rw-r--r--typecheck.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/typecheck.c b/typecheck.c
index 0bca1e3a..afbc8df4 100644
--- a/typecheck.c
+++ b/typecheck.c
@@ -829,6 +829,7 @@ type_t *get_type(env_t *env, ast_t *ast)
else if (streq(call->name, "heapify")) return Type(VoidType);
else if (streq(call->name, "insert")) return Type(VoidType);
else if (streq(call->name, "insert_all")) return Type(VoidType);
+ else if (streq(call->name, "pop")) return Type(OptionalType, .type=item_type);
else if (streq(call->name, "random")) return item_type;
else if (streq(call->name, "remove_at")) return Type(VoidType);
else if (streq(call->name, "remove_item")) return Type(VoidType);