Workaround for rdar://141977987

rintaro · rintaro · commit 2829606f519f · 2025-01-01T14:23:48.000-08:00
diff --git a/Sources/SwiftSyntax/Syntax.swift b/Sources/SwiftSyntax/Syntax.swift
@@ -69,8 +69,10 @@ public struct Syntax: SyntaxProtocol, SyntaxHashable {
   }
 
   public var id: SyntaxIdentifier {
-    SyntaxIdentifier(
-      rootId: UInt(rawID: arena.root.pointee.raw.id),
+    // This var is a workaround for a potential compiler bug (rdar://141977987)
+    let rootDataRef = arena.root
+    return SyntaxIdentifier(
+      rootId: UInt(rawID: rootDataRef.pointee.raw.id),
       indexInTree: SyntaxIdentifier.SyntaxIndexInTree(indexInTree: absoluteInfo.indexInTree)
     )
   }

Original file line number	Diff line number	Diff line change
`@@ -69,8 +69,10 @@ public struct Syntax: SyntaxProtocol, SyntaxHashable {`
`69`	`69`	`}`
`70`	`70`
`71`	`71`	`public var id: SyntaxIdentifier {`
`72`		`- SyntaxIdentifier(`
`73`		`- rootId: UInt(rawID: arena.root.pointee.raw.id),`
	`72`	`+ // This var is a workaround for a potential compiler bug (rdar://141977987)`
	`73`	`+ let rootDataRef = arena.root`
	`74`	`+ return SyntaxIdentifier(`
	`75`	`+ rootId: UInt(rawID: rootDataRef.pointee.raw.id),`
`74`	`76`	`indexInTree: SyntaxIdentifier.SyntaxIndexInTree(indexInTree: absoluteInfo.indexInTree)`
`75`	`77`	`)`
`76`	`78`	`}`