#37542
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Ran 18 May 2023 12:25PM UTC

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Files 340

Run time 9s

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Build # #37542

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push

local

Committed by

web-flow

Commit Message

inference: prioritize `SlotNumber`-constraint over `MustAlias`-constraint (#49856)

Currently external `AbstractInterpreter` that uses `MustAliasesLattice`
can fail to propagate type constraint on `SlotNumber` in the call-site
refinement, e.g. fail to infer the return type of `firstitem(::ItrList)`
in the following code:
```julia
struct ItrList
    list::Union{Tuple{},Vector{Int}}
end

hasitems(list) = length(list) >= 1

function firstitem(ilist::ItrList)
    list = ilist.list
    if hasitems(list)
        return list
    end
    error("list is empty")
end
```

(xref: <https://github.com/aviatesk/JET.jl/issues/509#issuecomment-1546658476>)

This commit fixes it up as well as fixes the implementation of
`from_interprocedural!` so that it uses the correct lattice.

Run Details

71262 of 83271 relevant lines covered (85.58%)

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Jobs

ID	Job ID	Ran	Files	Coverage
1	#37542.1	18 May 2023 12:25PM UTC	340	85.58

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