mycpp/examples use heap-allocated Tuple and crash

[andychu]

But it doesn't have a GC header! (which should be OBJ_HEADER() or gc_heap::Obj)

[andychu]

Questions: Does bin/osh_eval use heap-allocated tuples? Yes probably.

Solutions:

1. Rewrite tuples to ASDL records.
2. Support heap-allocated tuples with records

[scallyw4g]

Yeah osh_eval definitely allocates lists of tuples.

[andychu]

There are several that do this:

• examples/tuple_return_value
• examples/test_cast
• examples/loops uses a heap-allocated list of tuples

[andychu]

We use heap-allocated tuples in cpp/leaky_frontend_match.h as well :-/

[andychu]

22096e5

[andychu]

Released: https://www.oilshell.org/release/0.12.7/