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[SR-14824] Improve diagnostic for multi-statement closures instead of saying "too complex closure return type" #57172

typesanitizer opened this issue Jun 24, 2021 · 1 comment


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@typesanitizer typesanitizer commented Jun 24, 2021

Previous ID SR-14824
Radar rdar://problem/79742920
Original Reporter @typesanitizer
Type Improvement
Status Closed
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement, DiagnosticsQoI, StarterBug, TypeChecker
Assignee jiaren wang (JIRA)
Priority Medium

md5: 36dfe752f68258a70ceeb284792464d3

Issue Description:

See – it's not clear why a closure is "too complex" because from a user perspective, it looks quite simple.

In case there are multiple statements, we can provide a more specialized diagnostic saying that the compiler doesn't support inferring types of closures with multiple statements.

_ = { // error: Unable to infer complex closure return type; add explicit type to disambiguate
    _ = "" // or anything else here
    return ""
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@typesanitizer typesanitizer commented Jun 24, 2021

@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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