Generate @resultbuilder with SwiftSyntaxBuilder

Author: kimdv

Package.swift

@@ -77,8 +77,7 @@ let package = Package(
       dependencies: ["SwiftSyntax"],
       exclude: [
         "gyb_helpers",
-        "BuildableNodes.swift.gyb",
-        "ResultBuilders.swift.gyb",
+        "BuildableNodes.swift.gyb"
       ]
     ),
     .target(

Sources/SwiftSyntax/Syntax.swift

@@ -355,23 +355,7 @@ public extension SyntaxProtocol {
   /// Returns a new syntax node with its leading trivia replaced
   /// by the provided trivia.
   func withLeadingTrivia(_ leadingTrivia: Trivia) -> Self {
-    var leadingTrivia: [TriviaPiece] = leadingTrivia.pieces
-
-    // If there is 3 or more, then we see if the first two is a newline and a space
-    // If so, we need to replace add the correct amount of space after each newline
-    // comming after to have the right indentation of the code.
-    if leadingTrivia.count > 2,
-       case .newlines = leadingTrivia[0],
-       case .spaces(let spaces) = leadingTrivia[1] {
-      
-      for i in (2..<leadingTrivia.count).reversed() {
-        if case .newlines = leadingTrivia[i] {
-          leadingTrivia.insert(.spaces(spaces), at: i + 1)
-        }
-      }
-    }
-
-    return Self(Syntax(data.withLeadingTrivia(Trivia(pieces: leadingTrivia))))!
+    return Self(Syntax(data.withLeadingTrivia(leadingTrivia)))!
   }
 
   /// Returns a new syntax node with its trailing trivia replaced

Sources/SwiftSyntaxBuilder/ResultBuilders.swift.gyb

@@ -3389,4 +3389,3 @@ public extension AvailabilitySpecList {
     self = itemsBuilder()
   }
 }
-