Support Java 16 language features

[altrisi]

The issue occurred when trying to migrateMappings in a Fabric project (running Loom 0.8, 1.16.5 mod). May be an issue with some Java 16 feature, that class uses at least var. Assumed it's a Mercury issue since it's present in many positions in the stacktrace.

Stacktrace

java.lang.RuntimeException: Failed to process: path\to\altrisi\scarpetapptester\config\GSONRecordAdapter.java
        at org.cadixdev.mercury.Mercury.accept(Mercury.java:237)
        at org.cadixdev.mercury.Mercury$Requestor.acceptAST(Mercury.java:260)
        at org.eclipse.jdt.core.dom.CompilationUnitResolver.resolve(CompilationUnitResolver.java:1068)
        at org.eclipse.jdt.core.dom.CompilationUnitResolver.resolve(CompilationUnitResolver.java:662)
        at org.eclipse.jdt.core.dom.ASTParser.createASTs(ASTParser.java:1013)
        at org.cadixdev.mercury.Mercury.run(Mercury.java:212)
        at org.cadixdev.mercury.Mercury.rewrite(Mercury.java:167)
        at net.fabricmc.loom.task.MigrateMappingsTask.migrateMappings(MigrateMappingsTask.java:189)
        at net.fabricmc.loom.task.MigrateMappingsTask.doTask(MigrateMappingsTask.java:104)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:58)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:51)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:29)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$2.run(ExecuteActionsTaskExecuter.java:498)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71)
        at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:483)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:466)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$300(ExecuteActionsTaskExecuter.java:105)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.executeWithPreviousOutputFiles(ExecuteActionsTaskExecuter.java:270)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:248)
        at org.gradle.internal.execution.steps.ExecuteStep.executeInternal(ExecuteStep.java:83)
        at org.gradle.internal.execution.steps.ExecuteStep.access$000(ExecuteStep.java:37)
        at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:50)
        at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:47)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:62)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$call$2(DefaultBuildOperationExecutor.java:76)
        at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:76)
        at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:47)
        at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:37)
        at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:68)
        at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:38)
        at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:50)
        at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:36)
        at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:41)
        at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:74)
        at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:55)
        at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:51)
        at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:29)
        at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:54)
        at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:35)
        at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:60)
        at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:27)
        at org.gradle.internal.execution.steps.BuildCacheStep.executeWithoutCache(BuildCacheStep.java:174)
        at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:74)
        at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:45)
        at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:40)
        at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:29)
        at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:36)
        at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:22)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:99)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:92)
        at java.base/java.util.Optional.map(Optional.java:260)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:52)
        at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:36)
        at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:84)
        at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:41)
        at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:37)
        at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:27)
        at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:91)
        at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:49)
        at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:78)
        at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:49)
        at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:105)
        at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:50)
        at org.gradle.internal.execution.steps.SkipEmptyWorkStep.lambda$execute$2(SkipEmptyWorkStep.java:86)
        at java.base/java.util.Optional.orElseGet(Optional.java:364)
        at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:86)
        at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:32)
        at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:38)
        at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:43)
        at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:31)
        at org.gradle.internal.execution.steps.AssignWorkspaceStep.lambda$execute$0(AssignWorkspaceStep.java:40)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution$2.withWorkspace(ExecuteActionsTaskExecuter.java:283)
        at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:40)
        at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:30)
        at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:37)
        at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:27)
        at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:49)
        at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:35)
        at org.gradle.internal.execution.impl.DefaultExecutionEngine$1.execute(DefaultExecutionEngine.java:76)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:184)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:173)
        at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109)
        at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
        at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:62)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$call$2(DefaultBuildOperationExecutor.java:76)
        at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:76)
        at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
        at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:74)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:408)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:395)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:388)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:374)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
        at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
        at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.IllegalArgumentException: Invalid identifier : >[Ljava<
        at org.eclipse.jdt.core.dom.SimpleName.setIdentifier(SimpleName.java:243)
        at org.eclipse.jdt.core.dom.AST.newSimpleName(AST.java:2597)
        at org.eclipse.jdt.core.dom.AST.newName(AST.java:2285)
        at org.cadixdev.mercury.remapper.RemapperVisitor.remapType(RemapperVisitor.java:124)
        at org.cadixdev.mercury.remapper.RemapperVisitor.visit(RemapperVisitor.java:178)
        at org.cadixdev.mercury.remapper.SimpleRemapperVisitor.visit(SimpleRemapperVisitor.java:183)
        at org.eclipse.jdt.core.dom.SimpleName.accept0(SimpleName.java:198)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2975)
        at org.eclipse.jdt.core.dom.SimpleType.accept0(SimpleType.java:195)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2975)
        at org.eclipse.jdt.core.dom.VariableDeclarationStatement.accept0(VariableDeclarationStatement.java:253)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2998)
        at org.eclipse.jdt.core.dom.Block.accept0(Block.java:128)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2975)
        at org.eclipse.jdt.core.dom.IfStatement.accept0(IfStatement.java:183)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2998)
        at org.eclipse.jdt.core.dom.Block.accept0(Block.java:128)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2975)
        at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:617)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2998)
        at org.eclipse.jdt.core.dom.AnonymousClassDeclaration.accept0(AnonymousClassDeclaration.java:135)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2975)
        at org.eclipse.jdt.core.dom.ClassInstanceCreation.accept0(ClassInstanceCreation.java:305)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2975)
        at org.eclipse.jdt.core.dom.ReturnStatement.accept0(ReturnStatement.java:128)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2998)
        at org.eclipse.jdt.core.dom.Block.accept0(Block.java:128)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2975)
        at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:617)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2998)
        at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:447)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2998)
        at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:258)
        at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2927)
        at org.cadixdev.mercury.remapper.MercuryRemapper.rewrite(MercuryRemapper.java:54)
        at org.cadixdev.mercury.SourceRewriter.process(SourceRewriter.java:20)
        at org.cadixdev.mercury.SourceContext.process(SourceContext.java:82)
        at org.cadixdev.mercury.RewriteContext.process(RewriteContext.java:106)
        at org.cadixdev.mercury.Mercury.accept(Mercury.java:235)
        ... 136 more
:remapped project written to path\to\remappedSrc

Class where it fails

package altrisi.scarpetapptester.config;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.HashMap;

import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;

class GSONRecordAdapter implements TypeAdapterFactory {
	
    @Override
    public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
       @SuppressWarnings("unchecked")
       Class<T> clazz = (Class<T>) type.getRawType();
       if (!clazz.isRecord()) {
          return null;
       }
       TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);

       return new TypeAdapter<T>() {
          @Override
          public void write(JsonWriter out, T value) throws IOException {
             delegate.write(out, value);
          }

          @Override
          public T read(JsonReader reader) throws IOException {
             if (reader.peek() == JsonToken.NULL) {
                reader.nextNull();
                return null;
             } else {
                var recordComponents = clazz.getRecordComponents();
                var typeMap = new HashMap<String,TypeToken<?>>();
                for (int i = 0; i < recordComponents.length; i++) {
                   typeMap.put(recordComponents[i].getName(), TypeToken.get(recordComponents[i].getGenericType()));
                }
                var argsMap = new HashMap<String,Object>();
                reader.beginObject();
                while (reader.hasNext()) {
                   String name = reader.nextName();
                   argsMap.put(name, gson.getAdapter(typeMap.get(name)).read(reader));
                }
                reader.endObject();

                var argTypes = new Class<?>[recordComponents.length];
                var args = new Object[recordComponents.length];
                for (int i = 0; i < recordComponents.length; i++) {
                   argTypes[i] = recordComponents[i].getType();
                   args[i] = argsMap.get(recordComponents[i].getName());
                }
                Constructor<T> constructor;
                try {
                   constructor = clazz.getDeclaredConstructor(argTypes);
                   constructor.setAccessible(true);
                   return constructor.newInstance(args);
                } catch (IllegalArgumentException | ReflectiveOperationException e) {
                   throw new RuntimeException(e);
                }
             }
          }
       };
    }
}

Also (not sure if this is an issue with Mercury or not), after removing that class and running migrateMappings again, classes which declared records as nested classes got a failing import record; in their list of imports, and var was replaced with the actual type.

[jamierocks]

It's probably a consequence of the JDT being old in the published build - will update and publish a new Mercury version soon.

[jamierocks]

0277125 may well present a fix, unsure though.

[jamierocks]

Looks like we'll have to wait until JDT 3.26 - https://github.com/eclipse/eclipse.jdt.core/commit/fd6db01a1ee874ef9fe027d48fc549331ceea29a#diff-23943f685010f4e86bb88902ca769cd7ad6df4c88119e62dfbd50fcc1ec34474R21

[jpenilla]

Tested with Mercury 0.1.0 and manually bumping JDT to 3.27.0, records still don't remap properly/at all. References to records get remapped properly, however records themselves are not remapped. Top level records have the .java file renamed and nothing else, inner records fail to remap and seem to cause Mercury to give up on remapping that java file.

[quat1024]

Ran into this when using Loom's migrateMappings task to convert a 1.17 mod that used records in its source code from yarn to mojang names. No members inside the record get remapped; sometimes it would just delete all the imports from the file and carry on.

Since I control the mod source, the solution was to use intellij's "convert record to class" intention on all the records, run the Gradle task, then convert them all back