Fix issue with Eclipse containers

"Attempted to beginRule"
See: #59 (comment)

core/statix.referenceretention.pie/src/main/java/mb/statix/referenceretention/pie/InlineMethodCallTaskDef.java

@@ -13,6 +13,7 @@
 import mb.pie.api.Supplier;
 import mb.pie.api.TaskDef;
 import mb.resource.ResourceKey;
+import mb.resource.hierarchical.ResourcePath;
 import mb.spoofax.core.language.command.CommandFeedback;
 import mb.spoofax.core.language.command.ShowFeedback;
 import mb.statix.referenceretention.stratego.RRStrategoContext;
@@ -35,13 +36,16 @@
 public class InlineMethodCallTaskDef implements TaskDef<InlineMethodCallTaskDef.Args, CommandFeedback> {
 
     public static class Args implements Serializable {
+        public final ResourcePath project;
         public final ResourceKey resource;
         public final @Nullable Region region;
 
         public Args(
+            ResourcePath project,
             ResourceKey resource,
             @Nullable Region region
         ) {
+            this.project = project;
             this.resource = resource;
             this.region = region;
         }
@@ -50,20 +54,23 @@ public Args(
             if(this == o) return true;
             if(o == null || getClass() != o.getClass()) return false;
             final Args that = (Args)o;
-            return this.resource.equals(that.resource)
+            return Objects.equals(this.project, that.project)
+                && this.resource.equals(that.resource)
                 && Objects.equals(this.region, that.region);
         }
 
         @Override public int hashCode() {
             return Objects.hash(
+                project,
                 resource,
                 region
             );
         }
 
         @Override public String toString() {
             return "InlineMethodCallTaskDef.Input{" +
-                "file=" + resource + "," +
+                "project=" + project + "," +
+                "resource=" + resource + "," +
                 "region=" + region +
             '}';
         }

example/tiger/spoofax3/tiger.spoofax3/spoofaxc.cfg

@@ -51,6 +51,11 @@ let inlineMethodCommand = command-def {
   display-name = "Inline method call"
   description = "Inline a method call."
   parameters = [
+    project {
+      type = java mb.resource.hierarchical.ResourcePath
+      required = true
+      argument-providers = [ EnclosingContext(Project) ]
+    }
     resource {
       type = java mb.resource.ResourceKey
       required = true
@@ -68,6 +73,7 @@ editor-context-menu [
     command-action {
       command-def = inlineMethodCommand
       execution-type = Once
+      required-enclosing-resource-types = [Project]
     }
   ]
 ]
@@ -78,6 +84,7 @@ resource-context-menu [
       command-def = inlineMethodCommand
       execution-type = Once
       required-resource-types = [File]
+      required-enclosing-resource-types = [Project]
     }
   ]
 ]