JuliaLang / julia / #37848

77%

Build Type

push

local

Committed by web-flow

Commit Message

inference: refine branched `Conditional` types (#55216)

Separated from JuliaLang/julia#40880.
This subtle adjustment allows for more accurate type inference in the
following kind of cases:
```julia
function condition_object_update2(x)
    cond = x isa Int
    if cond # `cond` is known to be `Const(true)` within this branch
        return !cond ? nothing : x # ::Int
    else
        return  cond ? nothing : 1 # ::Int
    end
end
@test Base.infer_return_type(condition_object_update2, (Any,)) == Int
```

Also cleans up typelattice.jl a bit.

Run Details

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57 existing lines in 4 files now uncovered.

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