Port connect panic in force_order for CallIndirect

[ss2165]

Generating guppy (v0.17):

@guppy
def bar(x: int) -> int:
    return x

@guppy
@no_type_check
def foo(f: Callable[[int], int], y: int) -> int:
    return f(y) 

@guppy
@no_type_check
def main() -> None:
    foo(bar, 1)

Error (port number is too high):

---- force_order::test::call_indirect_bug stdout ----

thread 'force_order::test::call_indirect_bug' panicked at hugr-core/src/hugr/hugrmut.rs:372:9:
Received an invalid port Port(Incoming, 3) for node Node(18) while mutating a HUGR:

stack backtrace:
   0: rust_begin_unwind
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library/std/src/panicking.rs:692:5
   1: core::panicking::panic_fmt
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library/core/src/panicking.rs:75:14
   2: hugr_core::hugr::hugrmut::panic_invalid_port
             at /Users/seyon/ng/hugr/hugr-core/src/hugr/hugrmut.rs:627:9
   3: <T as hugr_core::hugr::hugrmut::HugrMut>::connect
             at /Users/seyon/ng/hugr/hugr-core/src/hugr/hugrmut.rs:372:9
   4: hugr_passes::force_order::force_order_by_key
             at ./src/force_order.rs:92:17
   5: hugr_passes::force_order::force_order
             at ./src/force_order.rs:44:5
   6: hugr_passes::force_order::test::call_indirect_bug
             at ./src/force_order.rs:347:9
   7: hugr_passes::force_order::test::call_indirect_bug::{{closure}}
             at ./src/force_order.rs:333:27
   8: core::ops::function::FnOnce::call_once
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library/core/src/ops/function.rs:250:5
   9: core::ops::function::FnOnce::call_once
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library/core/src/ops/function.rs:250:5

 graph LR
    subgraph 0 ["(0) Module"]
        direction LR
        subgraph 1 ["(1) FuncDefn: #quot;bar#quot;"]
            direction LR
            2["(2) Input"]
            3["(3) Output"]
            subgraph 4 ["(4) CFG"]
                direction LR
                subgraph 5 ["(5) DataflowBlock"]
                    direction LR
                    6["(6) Input"]
                    7["(7) Output"]
                    9["(9) Tag"]
                    6--"0:1<br>int(6)"-->7
                    6-."1:0".->9
                    9--"0:0<br>Unit"-->7
                end
                8["(8) ExitBlock"]
                5-."0:0".->8
            end
            2--"0:0<br>int(6)"-->4
            4--"0:0<br>int(6)"-->3
        end
        subgraph 10 ["(10) FuncDefn: #quot;foo#quot;"]
            direction LR
            11["(11) Input"]
            12["(12) Output"]
            subgraph 13 ["(13) CFG"]
                direction LR
                subgraph 14 ["(14) DataflowBlock"]
                    direction LR
                    15["(15) Input"]
                    16["(16) Output"]
                    18["(18) CallIndirect"]
                    19["(19) Tag"]
                    15--"0:0<br>[int(6)] -> [int(6)]"-->18
                    15--"1:1<br>int(6)"-->18
                    15-."2:0".->19
                    18--"0:1<br>int(6)"-->16
                    19--"0:0<br>Unit"-->16
                end
                17["(17) ExitBlock"]
                14-."0:0".->17
            end
            11--"0:0<br>[int(6)] -> [int(6)]"-->13
            11--"1:1<br>int(6)"-->13
            13--"0:0<br>int(6)"-->12
        end
        subgraph 20 ["(20) FuncDefn: #quot;main#quot;"]
            direction LR
            21["(21) Input"]
            22["(22) Output"]
            subgraph 23 ["(23) CFG"]
                direction LR
                subgraph 24 ["(24) DataflowBlock"]
                    direction LR
                    25["(25) Input"]
                    26["(26) Output"]
                    28["(28) LoadFunction"]
                    29["(29) const:custom:u64(1)"]
                    30["(30) LoadConstant"]
                    31["(31) Call"]
                    32["(32) Tag"]
                    28--"0:0<br>[int(6)] -> [int(6)]"-->31
                    29--"0:0<br>int(6)"-->30
                    30--"0:1<br>int(6)"-->31
                    32--"0:0<br>Unit"-->26
                end
                27["(27) ExitBlock"]
                24-."0:0".->27
            end
            21-."0:0".->23
            23-."0:0".->22
        end
        1--"0:0<br>[int(6)] -> [int(6)]"-->28
        10--"0:2<br>[[int(6)] -> [int(6)], int(6)] -> [int(6)]"-->31
    end

Loading

generated HUGR envelope

``` 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paque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"output":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"runtime_reqs":[]}},{"parent":14,"op":"Tag","tag":0,"variants":[[]]},{"parent":0,"op":"FuncDefn","name":"main","signature":{"params":[],"body":{"t":"G","input":[],"output":[],"runtime_reqs":[]}}},{"parent":20,"op":"Input","types":[]},{"parent":20,"op":"Output","types":[]},{"parent":20,"op":"CFG","signature":{"t":"G","input":[],"output":[],"runtime_reqs":[]}},{"parent":23,"op":"DataflowBlock","inputs":[],"other_outputs":[],"sum_rows":[[]],"extension_delta":[]},{"parent":24,"op":"Input","types":[]},{"parent":24,"op":"Output","types":[{"t":"Sum","s":"Unit","size":1}]},{"parent":23,"op":"ExitBlock","cfg_outputs":[]},{"parent":24,"op":"LoadFunction","func_sig":{"params":[],"body":{"t":"G","input":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"output":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"runtime_reqs":[]}},"type_args":[],"instantiation":{"t":"G","input":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"output":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"runtime_reqs":[]}},{"parent":24,"op":"Const","v":{"v":"Extension","extensions":["arithmetic.int.types"],"typ":{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"},"value":{"c":"ConstInt","v":{"log_width":6,"value":1}}}},{"parent":24,"op":"LoadConstant","datatype":{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}},{"parent":24,"op":"Call","func_sig":{"params":[],"body":{"t":"G","input":[{"t":"G","input":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"output":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"runtime_reqs":[]},{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"output":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"runtime_reqs":[]}},"type_args":[],"instantiation":{"t":"G","input":[{"t":"G","input":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"output":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"runtime_reqs":[]},{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"output":[{"t":"Opaque","extension":"arithmetic.int.types","id":"int","args":[{"tya":"BoundedNat","n":6}],"bound":"C"}],"runtime_reqs":[]}},{"parent":24,"op":"Tag","tag":0,"variants":[[]]}],"edges":[[[2,0],[4,0]],[[9,0],[7,0]],[[6,0],[7,1]],[[5,0],[8,0]],[[4,0],[3,0]],[[11,0],[13,0]],[[11,1],[13,1]],[[15,0],[18,0]],[[15,1],[18,1]],[[19,0],[16,0]],[[18,0],[16,1]],[[14,0],[17,0]],[[13,0],[12,0]],[[1,0],[28,0]],[[29,0],[30,0]],[[10,0],[31,2]],[[28,0],[31,0]],[[30,0],[31,1]],[[32,0],[26,0]],[[24,0],[27,0]]],"metadata":[],"encoder":null}],"extensions":[{"version":"0.1.0","name":"tket2.futures","runtime_reqs":[],"types":{"Future":{"extension":"tket2.futures","name":"Future","description":"A 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[ss2165]

Failing test in #2006