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Code Issues 8 Packages Projects Releases Wiki Activity

Compiler Performance Issue in BlockGridView.swift #8

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opened 2025-12-29 04:20:09 +01:00 by adam · 0 comments
adam commented 2025-12-29 04:20:09 +01:00
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Originally created by @jchillah on GitHub (Mar 3, 2025).

The Swift compiler is unable to type-check the ForEach expression in BlockGridView.swift within a reasonable time. This issue occurs at line 67, where a complex mapping operation is performed inside ForEach.

Steps to Reproduce:

Open BlockGridView.swift
Try to build the project
The compiler fails with the message:
"The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions."

Expected Behavior:

The project should compile without performance issues.
Actual Behavior:

Compilation takes too long or fails due to the complexity of the expression.
Proposed Fix:

Move the .map { ... } operation outside of ForEach to reduce the computational overhead.
Use explicit indices instead of inline transformations to optimize type-checking.
References:

Related Swift compiler issue: Swift Compiler Performance Guide

Originally created by @jchillah on GitHub (Mar 3, 2025). The Swift compiler is unable to type-check the ForEach expression in BlockGridView.swift within a reasonable time. This issue occurs at line 67, where a complex mapping operation is performed inside ForEach. Steps to Reproduce: Open BlockGridView.swift Try to build the project The compiler fails with the message: "The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions." Expected Behavior: The project should compile without performance issues. Actual Behavior: Compilation takes too long or fails due to the complexity of the expression. Proposed Fix: Move the .map { ... } operation outside of ForEach to reduce the computational overhead. Use explicit indices instead of inline transformations to optimize type-checking. References: Related Swift compiler issue: [Swift Compiler Performance Guide](https://developer.apple.com/documentation/swift/swift_performance_optimizations)
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adam (Adam Melkus)
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Reference: starred/SwiftUI#8