From 3c13291dab12573c321b605abc3f9c4245a0599d Mon Sep 17 00:00:00 2001
From: Robert Goss <goss.robert@gmail.com>
Date: Tue, 26 Sep 2023 16:48:04 +0100
Subject: [PATCH] Avoid spurious rust warnings if interfaces unused

---
 Source/buildimplementationrust.go | 15 +++++++++++----
 Source/languagerust.go            | 11 ++++++++++-
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/Source/buildimplementationrust.go b/Source/buildimplementationrust.go
index 2963aa4f..dd29bb66 100644
--- a/Source/buildimplementationrust.go
+++ b/Source/buildimplementationrust.go
@@ -315,16 +315,21 @@ func writeRustTraitFn(method ComponentDefinitionMethod, w LanguageWriter, hasSel
 			return err
 		}
 		RustParam := RustParams[0]
+		paramName := RustParam.ParamName
+		if hasImpl && !hasImplParent {
+			// For stubed out methods avoid warning about unued parameters
+			paramName = "_" + RustParam.ParamName
+		}
 		if param.ParamPass != "return" {
 			if parameterString == "" {
-				parameterString += fmt.Sprintf("%s : %s", RustParam.ParamName, RustParam.ParamType)
+				parameterString += fmt.Sprintf("%s : %s", paramName, RustParam.ParamType)
 			} else {
-				parameterString += fmt.Sprintf(", %s : %s", RustParam.ParamName, RustParam.ParamType)
+				parameterString += fmt.Sprintf(", %s : %s", paramName, RustParam.ParamType)
 			}
 			if parameterNames == "" {
-				parameterNames += RustParam.ParamName
+				parameterNames += paramName
 			} else {
-				parameterNames += fmt.Sprintf(", %s", RustParam.ParamName)
+				parameterNames += fmt.Sprintf(", %s", paramName)
 			}
 		} else {
 			returnType = RustParam.ParamType
@@ -557,6 +562,7 @@ func buildRustHandle(component ComponentDefinition, w LanguageWriter, InterfaceM
 	w.Writeln("")
 	w.Writeln("use %s::*;", InterfaceMod)
 	w.Writeln("")
+	w.Writeln("#[allow(dead_code)]")
 	w.Writeln("impl HandleImpl {")
 	w.AddIndentationLevel(1)
 	for i := 0; i < len(component.Classes); i++ {
@@ -660,6 +666,7 @@ func writeRustMethodWrapper(method ComponentDefinitionMethod, optclass *Componen
 			}
 		}
 	}
+	w.Writeln("#[no_mangle]")
 	w.Writeln("pub fn %s%s(%s) -> i32 {", cprefix, strings.ToLower(method.MethodName), parameterString)
 	w.AddIndentationLevel(1)
 	// Convert self parameter if non global
diff --git a/Source/languagerust.go b/Source/languagerust.go
index 94e83c6b..1c3dbefe 100644
--- a/Source/languagerust.go
+++ b/Source/languagerust.go
@@ -53,10 +53,15 @@ func writeRustBaseTypeDefinitions(componentdefinition ComponentDefinition, w Lan
 	w.Writeln(" Version definition for %s", NameSpace)
 	w.Writeln("**************************************************************************************************************************/")
 	w.Writeln("")
+	w.Writeln("#[allow(dead_code)]")
 	w.Writeln("pub const %s_VERSION_MAJOR : usize = %d;", strings.ToUpper(NameSpace), majorVersion(componentdefinition.Version))
+	w.Writeln("#[allow(dead_code)]")
 	w.Writeln("pub const %s_VERSION_MINOR : usize = %d;", strings.ToUpper(NameSpace), minorVersion(componentdefinition.Version))
+	w.Writeln("#[allow(dead_code)]")
 	w.Writeln("pub const %s_VERSION_MICRO : usize= %d;", strings.ToUpper(NameSpace), microVersion(componentdefinition.Version))
+	w.Writeln("#[allow(dead_code)]")
 	w.Writeln("pub const %s_VERSION_PRERELEASEINFO : &str = \"%s\";", strings.ToUpper(NameSpace), preReleaseInfo(componentdefinition.Version))
+	w.Writeln("#[allow(dead_code)]")
 	w.Writeln("pub const %s_VERSION_BUILDINFO : &str = \"%s\";", strings.ToUpper(NameSpace), buildInfo(componentdefinition.Version))
 
 	w.Writeln("")
@@ -67,9 +72,11 @@ func writeRustBaseTypeDefinitions(componentdefinition ComponentDefinition, w Lan
 		w.Writeln(" Error constants for %s", NameSpace)
 		w.Writeln("**************************************************************************************************************************/")
 		w.Writeln("")
+		w.Writeln("#[allow(dead_code)]")
 		w.Writeln("pub const %s_SUCCESS : i32 = 0;", strings.ToUpper(NameSpace))
 		for i := 0; i < len(componentdefinition.Errors.Errors); i++ {
 			errorcode := componentdefinition.Errors.Errors[i]
+			w.Writeln("#[allow(dead_code)]")
 			if errorcode.Description != "" {
 				w.Writeln("pub const %s_ERROR_%s : i32 = %d; /** %s */", strings.ToUpper(NameSpace), errorcode.Name, errorcode.Code, errorcode.Description)
 			} else {
@@ -85,6 +92,8 @@ func writeRustBaseTypeDefinitions(componentdefinition ComponentDefinition, w Lan
 	w.Writeln("**************************************************************************************************************************/")
 	w.Writeln("")
 	w.Writeln("// Enum of all traits - this acts as a handle as we pass trait pointers through the interface")
+	w.Writeln("")
+	w.Writeln("#[allow(dead_code)]")
 	w.Writeln("pub enum HandleImpl {")
 	w.AddIndentationLevel(1)
 	for i := 0; i < len(componentdefinition.Classes); i++ {
@@ -101,7 +110,7 @@ func writeRustBaseTypeDefinitions(componentdefinition ComponentDefinition, w Lan
 	w.Writeln("pub type Handle = *mut HandleImpl;")
 	for i := 0; i < len(componentdefinition.Classes); i++ {
 		class := componentdefinition.Classes[i]
-		w.Writeln("pub type %sHandle = *mut HandleImpl;", class.ClassName)
+		w.Writeln("pub type %sHandle =Handle;", class.ClassName)
 	}
 
 	if len(componentdefinition.Enums) > 0 {