Negative coverage: `prove_place_is_movable` / `field` / premise `if let None = env.program.find_drop_impl(adt_id)`

Premise at line 1066. Observed failure causes: if_let.

field

Line	Coverage	Source
1066	1	(if let None = env.program.find_drop_impl(adt_id))
1067	✗	(prove_place_is_movable(env, assumptions, state, prefix) => state)
		──────── ("field")
1069	7	(prove_place_is_movable( env, assumptions, state, TypedPlaceExpressionData::Field(prefix, _, adt_id, _), ) => state)

1 test failed proving this premise:

Source location: tests/borrowck.rs:3891 (all coverage from this test)

fn foo(f: Pair) -> () {
    let s: Datum = f.x;
}

Failed proof tree

check_all_crates failed mod.rs:42
- args
- rule "check all prefixes" mod.rs:54
  - check_crate failed mod.rs:61
    
    args
    
    rule "check crate" mod.rs:74
    
    check_crate_item failed mod.rs:179
    
    rule "free fn" mod.rs:207
    
    check_free_fn failed fns.rs:14
    
    args
    
    rule "check free fn" fns.rs:24
    
    check_fn failed fns.rs:31
    
    args
    
    rule "check fn" fns.rs:54
    
    check_fn_body failed fns.rs:61
    
    args
    
    rule "expr fn body" fns.rs:89
    
    borrow_check failed nll.rs:124
    
    args
    
    rule "borrow_check" nll.rs:135
    
    borrow_check_block failed nll.rs:142
    
    rule "basic block" nll.rs:157
    
    borrow_check_statement failed nll.rs:174
    
    args
    
    rule "let" nll.rs:189
    
    borrow_check_expr_has_ty failed nll.rs:350
    
    args
    
    rule "block" nll.rs:363
    
    borrow_check_expr failed nll.rs:371
    
    args
    
    rule "place" nll.rs:549
    
    prove_place_is_movable failed nll.rs:1040
    
    args
    
    rule "field" nll.rs:1066 (failed: if_let)

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