use sourceAccurate mode instead of fixedUp

Author: tayloraswift

Sources/MarkdownPluginSwift/Signature.Expanded (ext).swift

@@ -28,7 +28,10 @@ extension Signature.Expanded
 
         if !symbols.isEmpty
         {
-            fatalError("syntax didn’t round-trip, failed to match symbols: \(symbols)")
+            fatalError("""
+                syntax didn’t round-trip, failed to match symbols: \(symbols), \
+                source: '\(String.init(decoding: utf8, as: Unicode.UTF8.self))'
+                """)
         }
     }
 

Sources/MarkdownPluginSwift/SignatureSyntax.swift

@@ -27,7 +27,7 @@ extension SignatureSyntax
 
         let decl:DeclSyntax = .parse(from: &parser)
 
-        for region:Syntax in decl.children(viewMode: .fixedUp)
+        for region:Syntax in decl.children(viewMode: .sourceAccurate)
         {
             if  let clause:GenericParameterClauseSyntax =
                     region.as(GenericParameterClauseSyntax.self)
@@ -37,7 +37,7 @@ extension SignatureSyntax
             else if
                 let region:FunctionSignatureSyntax = region.as(FunctionSignatureSyntax.self)
             {
-                for region:Syntax in region.children(viewMode: .fixedUp)
+                for region:Syntax in region.children(viewMode: .sourceAccurate)
                 {
                     if  let clause:ParameterClauseSyntax =
                             region.as(ParameterClauseSyntax.self)
@@ -104,14 +104,14 @@ extension SignatureSyntax
     private mutating
     func append(clause region:GenericParameterClauseSyntax)
     {
-        for region:Syntax in region.children(viewMode: .fixedUp)
+        for region:Syntax in region.children(viewMode: .sourceAccurate)
         {
             if  let region:GenericParameterListSyntax =
                     region.as(GenericParameterListSyntax.self)
             {
                 for region:GenericParameterSyntax in region
                 {
-                    for region:Syntax in region.children(viewMode: .fixedUp)
+                    for region:Syntax in region.children(viewMode: .sourceAccurate)
                     {
                         if  let region:TokenSyntax = region.as(TokenSyntax.self),
                             case .identifier = region.tokenKind
@@ -134,7 +134,7 @@ extension SignatureSyntax
     private mutating
     func append(clause region:ParameterClauseSyntax)
     {
-        for region:Syntax in region.children(viewMode: .fixedUp)
+        for region:Syntax in region.children(viewMode: .sourceAccurate)
         {
             if  let region:FunctionParameterListSyntax =
                     region.as(FunctionParameterListSyntax.self)
@@ -153,7 +153,7 @@ extension SignatureSyntax
                     }
 
                     var firstName:Bool = true
-                    for region:Syntax in region.children(viewMode: .fixedUp)
+                    for region:Syntax in region.children(viewMode: .sourceAccurate)
                     {
                         if  firstName,
                             let region:TokenSyntax = region.as(TokenSyntax.self)

Sources/MarkdownPluginSwiftTests/Main.swift

@@ -74,6 +74,26 @@ enum Main:SyncTests
                 """)
             }
 
+            if  let tests:TestGroup = tests / "Malformed"
+            {
+                let decl:String = """
+                init(__readers: UInt32, \
+                __writers: UInt32,
+                __wrphase_futex: UInt32,
+                __writers_futex: UInt32,
+                __pad3: UInt32,
+                __pad4: UInt32,
+                __cur_writer: Int32,
+                __shared: Int32,
+                __rwelision: Int8,
+                __pad1: (UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt8), \
+                __pad2: UInt, \
+                __flags: UInt32)
+                """
+
+                let expanded:Signature<Never>.Expanded = .init(decl)
+                tests.expect("\(expanded.bytecode.safe)" ==? decl)
+            }
 
             if  let tests:TestGroup = tests / "Abridged"
             {