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[SR-11657] .first resolves to first(where:) on LazyMapSequence instead of its first property #54068

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swift-ci opened this issue Oct 23, 2019 · 2 comments
Open

[SR-11657] .first resolves to first(where:) on LazyMapSequence instead of its first property #54068

swift-ci opened this issue Oct 23, 2019 · 2 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself standard library Area: Standard library umbrella type checker Area → compiler: Semantic analysis

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@swift-ci
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Previous ID SR-11657
Radar rdar://problem/56542661
Original Reporter Lance (JIRA User)
Type Bug
Environment

Xcode 11.1 (11A1027)

Additional Detail from JIRA
Votes 0
Component/s Compiler, Standard Library
Labels Bug, TypeChecker
Assignee None
Priority Medium

md5: d9ce902e3846a9c915f4e46e78045d50

Issue Description:

let xs = [1,2,3]
 
let a = xs.enumerated().lazy.compactMap { t in t.offset % 2 == 0 ? t.offset : nil }.first
let b = zip(xs.indices, xs).lazy.compactMap { t in t.0 % 2 == 0 ? t.0 : nil }.first
let b = xs.indices.lazy.compactMap { t in t % 2 == 0 ? t : nil }.first

In the code above, both `a` and `b` are functions, only `c` is an `Int?` as expected. There seems to be a type checker bug here.
@belkadan
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@swift-ci create

@swift-ci
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swift-ci commented Nov 6, 2019

Comment by Kyle Macomber (JIRA)

It looks like this is happening because `enumerated` and `zip` are sequences and not collections.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself standard library Area: Standard library umbrella type checker Area → compiler: Semantic analysis
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@belkadan @swift-ci