50 files changed, 78 insertions, 6 deletions

diff --git a/examples/08-shared/hobgoblin.json5 b/examples/08-shared/hobgoblin.json5
new file mode 100644
index 0000000..f9f6597
--- /dev/null
+++ b/examples/08-shared/hobgoblin.json5
@@ -0,0 +1,19 @@
+{
+  outputs: {
+    langs: {
+      java: {
+        packageName: "org.zwobble.example.types",
+      },
+    },
+    generators: [
+      {
+        generator: "java-types",
+        path: "output/java/src/gen/java",
+      },
+      {
+        generator: "java-precisely-matchers",
+        path: "output/java/src/gen/java",
+      },
+    ],
+  }
+}
diff --git a/examples/08-custom-code/output/java/.gitignore b/examples/08-shared/output/java/.gitignore
index ff511d4..ff511d4 100644
--- a/examples/08-custom-code/output/java/.gitignore
+++ b/examples/08-shared/output/java/.gitignore
diff --git a/examples/08-custom-code/output/java/pom.xml b/examples/08-shared/output/java/pom.xml
index 445fa65..445fa65 120000
--- a/examples/08-custom-code/output/java/pom.xml
+++ b/examples/08-shared/output/java/pom.xml
diff --git a/examples/08-shared/output/java/src/test/java/org/zwobble/example/PointTests.java b/examples/08-shared/output/java/src/test/java/org/zwobble/example/PointTests.java
new file mode 100644
index 0000000..18a1961
--- /dev/null
+++ b/examples/08-shared/output/java/src/test/java/org/zwobble/example/PointTests.java
@@ -0,0 +1,16 @@
+package org.zwobble.example;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+import org.zwobble.example.types.point.Point;
+
+public class PointTests {
+    @Test
+    public void pointFields() {
+        Point point = new Point(10, 25);
+        int x = point.x();
+        int y = point.y();
+        assertEquals(x, 10);
+        assertEquals(y, 25);
+    }
+}
diff --git a/examples/08-shared/src/point.hob b/examples/08-shared/src/point.hob
new file mode 100644
index 0000000..7b9a8e6
--- /dev/null
+++ b/examples/08-shared/src/point.hob
@@ -0,0 +1,11 @@
+/// A straight line from one point to another.
+struct Line {
+    field start: Shared[Point];
+    field end: Shared[Point];
+}
+
+/// A 2D point.
+struct Point {
+    field x: Int32;
+    field y: Int32;
+}
diff --git a/examples/08-custom-code/hobgoblin.json5 b/examples/09-custom-code/hobgoblin.json5
index 1d08a40..1d08a40 100644
--- a/examples/08-custom-code/hobgoblin.json5
+++ b/examples/09-custom-code/hobgoblin.json5
diff --git a/examples/09-imports/output/java/.gitignore b/examples/09-custom-code/output/java/.gitignore
index ff511d4..ff511d4 100644
--- a/examples/09-imports/output/java/.gitignore
+++ b/examples/09-custom-code/output/java/.gitignore
diff --git a/examples/09-imports/output/java/pom.xml b/examples/09-custom-code/output/java/pom.xml
index 445fa65..445fa65 120000
--- a/examples/09-imports/output/java/pom.xml
+++ b/examples/09-custom-code/output/java/pom.xml
diff --git a/examples/08-custom-code/output/java/src/main/java/org/zwobble/example/types/shapes/Square.java b/examples/09-custom-code/output/java/src/main/java/org/zwobble/example/types/shapes/Square.java
index 169d729..169d729 100644
--- a/examples/08-custom-code/output/java/src/main/java/org/zwobble/example/types/shapes/Square.java
+++ b/examples/09-custom-code/output/java/src/main/java/org/zwobble/example/types/shapes/Square.java
diff --git a/examples/08-custom-code/output/java/src/test/java/org/zwobble/example/ShapesTests.java b/examples/09-custom-code/output/java/src/test/java/org/zwobble/example/ShapesTests.java
index fba8e6c..fba8e6c 100644
--- a/examples/08-custom-code/output/java/src/test/java/org/zwobble/example/ShapesTests.java
+++ b/examples/09-custom-code/output/java/src/test/java/org/zwobble/example/ShapesTests.java
diff --git a/examples/08-custom-code/output/rust/.gitignore b/examples/09-custom-code/output/rust/.gitignore
index ea8c4bf..ea8c4bf 100644
--- a/examples/08-custom-code/output/rust/.gitignore
+++ b/examples/09-custom-code/output/rust/.gitignore
diff --git a/examples/08-custom-code/output/rust/Cargo.lock b/examples/09-custom-code/output/rust/Cargo.lock
index 9dc6e3e..9dc6e3e 100644
--- a/examples/08-custom-code/output/rust/Cargo.lock
+++ b/examples/09-custom-code/output/rust/Cargo.lock
diff --git a/examples/08-custom-code/output/rust/Cargo.toml b/examples/09-custom-code/output/rust/Cargo.toml
index 5d4c622..5d4c622 100644
--- a/examples/08-custom-code/output/rust/Cargo.toml
+++ b/examples/09-custom-code/output/rust/Cargo.toml
diff --git a/examples/08-custom-code/output/rust/rust-toolchain.toml b/examples/09-custom-code/output/rust/rust-toolchain.toml
index 4fedb95..4fedb95 100644
--- a/examples/08-custom-code/output/rust/rust-toolchain.toml
+++ b/examples/09-custom-code/output/rust/rust-toolchain.toml
diff --git a/examples/08-custom-code/output/rust/src/gen/shapes.rs b/examples/09-custom-code/output/rust/src/gen/shapes.rs
index c5f8af5..c5f8af5 100644
--- a/examples/08-custom-code/output/rust/src/gen/shapes.rs
+++ b/examples/09-custom-code/output/rust/src/gen/shapes.rs
diff --git a/examples/08-custom-code/output/rust/src/lib.rs b/examples/09-custom-code/output/rust/src/lib.rs
index 1825d72..1825d72 100644
--- a/examples/08-custom-code/output/rust/src/lib.rs
+++ b/examples/09-custom-code/output/rust/src/lib.rs
diff --git a/examples/08-custom-code/output/rust/src/shapes.rs b/examples/09-custom-code/output/rust/src/shapes.rs
index f806bbb..f806bbb 100644
--- a/examples/08-custom-code/output/rust/src/shapes.rs
+++ b/examples/09-custom-code/output/rust/src/shapes.rs
diff --git a/examples/08-custom-code/src/shapes.hob b/examples/09-custom-code/src/shapes.hob
index 5dfe833..5dfe833 100644
--- a/examples/08-custom-code/src/shapes.hob
+++ b/examples/09-custom-code/src/shapes.hob
diff --git a/examples/09-imports/hobgoblin.json5 b/examples/10-imports/hobgoblin.json5
index 12713d4..12713d4 100644
--- a/examples/09-imports/hobgoblin.json5
+++ b/examples/10-imports/hobgoblin.json5
diff --git a/examples/10-transient-0/output/java/.gitignore b/examples/10-imports/output/java/.gitignore
index ff511d4..ff511d4 100644
--- a/examples/10-transient-0/output/java/.gitignore
+++ b/examples/10-imports/output/java/.gitignore
diff --git a/examples/10-transient-0/output/java/pom.xml b/examples/10-imports/output/java/pom.xml
index 445fa65..445fa65 120000
--- a/examples/10-transient-0/output/java/pom.xml
+++ b/examples/10-imports/output/java/pom.xml
diff --git a/examples/09-imports/output/java/src/test/java/org/zwobble/example/LineTests.java b/examples/10-imports/output/java/src/test/java/org/zwobble/example/LineTests.java
index c376b19..c376b19 100644
--- a/examples/09-imports/output/java/src/test/java/org/zwobble/example/LineTests.java
+++ b/examples/10-imports/output/java/src/test/java/org/zwobble/example/LineTests.java
diff --git a/examples/09-imports/output/rust/.gitignore b/examples/10-imports/output/rust/.gitignore
index ea8c4bf..ea8c4bf 100644
--- a/examples/09-imports/output/rust/.gitignore
+++ b/examples/10-imports/output/rust/.gitignore
diff --git a/examples/09-imports/output/rust/Cargo.lock b/examples/10-imports/output/rust/Cargo.lock
index 9dc6e3e..9dc6e3e 100644
--- a/examples/09-imports/output/rust/Cargo.lock
+++ b/examples/10-imports/output/rust/Cargo.lock
diff --git a/examples/09-imports/output/rust/Cargo.toml b/examples/10-imports/output/rust/Cargo.toml
index 5d4c622..5d4c622 100644
--- a/examples/09-imports/output/rust/Cargo.toml
+++ b/examples/10-imports/output/rust/Cargo.toml
diff --git a/examples/09-imports/output/rust/rust-toolchain.toml b/examples/10-imports/output/rust/rust-toolchain.toml
index 4fedb95..4fedb95 100644
--- a/examples/09-imports/output/rust/rust-toolchain.toml
+++ b/examples/10-imports/output/rust/rust-toolchain.toml
diff --git a/examples/09-imports/output/rust/src/lib.rs b/examples/10-imports/output/rust/src/lib.rs
index ffbcbf4..ffbcbf4 100644
--- a/examples/09-imports/output/rust/src/lib.rs
+++ b/examples/10-imports/output/rust/src/lib.rs
diff --git a/examples/09-imports/output/rust/src/line.rs b/examples/10-imports/output/rust/src/line.rs
index e29c94b..e29c94b 100644
--- a/examples/09-imports/output/rust/src/line.rs
+++ b/examples/10-imports/output/rust/src/line.rs
diff --git a/examples/09-imports/output/rust/src/point.rs b/examples/10-imports/output/rust/src/point.rs
index a0ca4c7..a0ca4c7 100644
--- a/examples/09-imports/output/rust/src/point.rs
+++ b/examples/10-imports/output/rust/src/point.rs
diff --git a/examples/09-imports/src/line.hob b/examples/10-imports/src/line.hob
index 562d77f..562d77f 100644
--- a/examples/09-imports/src/line.hob
+++ b/examples/10-imports/src/line.hob
diff --git a/examples/09-imports/src/point.hob b/examples/10-imports/src/point.hob
index 87f9953..87f9953 100644
--- a/examples/09-imports/src/point.hob
+++ b/examples/10-imports/src/point.hob
diff --git a/examples/10-transient-0/hobgoblin.json5 b/examples/11-transient-0/hobgoblin.json5
index 2160c60..2160c60 100644
--- a/examples/10-transient-0/hobgoblin.json5
+++ b/examples/11-transient-0/hobgoblin.json5
diff --git a/examples/11-transient-0/output/java/.gitignore b/examples/11-transient-0/output/java/.gitignore
new file mode 100644
index 0000000..ff511d4
--- /dev/null
+++ b/examples/11-transient-0/output/java/.gitignore
@@ -0,0 +1,2 @@
+/src/gen/
+/target/
diff --git a/examples/11-transient-0/output/java/pom.xml b/examples/11-transient-0/output/java/pom.xml
new file mode 120000
index 0000000..445fa65
--- /dev/null
+++ b/examples/11-transient-0/output/java/pom.xml
@@ -0,0 +1 @@
+../../../templates/java-junit/pom.xml
\ No newline at end of file
diff --git a/examples/10-transient-0/output/java/src/test/java/org/zwobble/example/Transient0Tests.java b/examples/11-transient-0/output/java/src/test/java/org/zwobble/example/Transient0Tests.java
index 6369f93..6369f93 100644
--- a/examples/10-transient-0/output/java/src/test/java/org/zwobble/example/Transient0Tests.java
+++ b/examples/11-transient-0/output/java/src/test/java/org/zwobble/example/Transient0Tests.java
diff --git a/examples/10-transient-0/output/rust/.gitignore b/examples/11-transient-0/output/rust/.gitignore
index ea8c4bf..ea8c4bf 100644
--- a/examples/10-transient-0/output/rust/.gitignore
+++ b/examples/11-transient-0/output/rust/.gitignore
diff --git a/examples/10-transient-0/output/rust/Cargo.lock b/examples/11-transient-0/output/rust/Cargo.lock
index 9dc6e3e..9dc6e3e 100644
--- a/examples/10-transient-0/output/rust/Cargo.lock
+++ b/examples/11-transient-0/output/rust/Cargo.lock
diff --git a/examples/10-transient-0/output/rust/Cargo.toml b/examples/11-transient-0/output/rust/Cargo.toml
index 5d4c622..5d4c622 100644
--- a/examples/10-transient-0/output/rust/Cargo.toml
+++ b/examples/11-transient-0/output/rust/Cargo.toml
diff --git a/examples/10-transient-0/output/rust/rust-toolchain.toml b/examples/11-transient-0/output/rust/rust-toolchain.toml
index 4fedb95..4fedb95 100644
--- a/examples/10-transient-0/output/rust/rust-toolchain.toml
+++ b/examples/11-transient-0/output/rust/rust-toolchain.toml
diff --git a/examples/10-transient-0/output/rust/src/data.rs b/examples/11-transient-0/output/rust/src/data.rs
index 7a0c4fa..7a0c4fa 100644
--- a/examples/10-transient-0/output/rust/src/data.rs
+++ b/examples/11-transient-0/output/rust/src/data.rs
diff --git a/examples/10-transient-0/output/rust/src/gen/data.rs b/examples/11-transient-0/output/rust/src/gen/data.rs
index 0ea6c0f..0ea6c0f 100644
--- a/examples/10-transient-0/output/rust/src/gen/data.rs
+++ b/examples/11-transient-0/output/rust/src/gen/data.rs
diff --git a/examples/10-transient-0/output/rust/src/gen/data/transient_0.rs b/examples/11-transient-0/output/rust/src/gen/data/transient_0.rs
index 82fb5f7..82fb5f7 100644
--- a/examples/10-transient-0/output/rust/src/gen/data/transient_0.rs
+++ b/examples/11-transient-0/output/rust/src/gen/data/transient_0.rs
diff --git a/examples/10-transient-0/output/rust/src/gen/transient_0.rs b/examples/11-transient-0/output/rust/src/gen/transient_0.rs
index 560fe51..560fe51 100644
--- a/examples/10-transient-0/output/rust/src/gen/transient_0.rs
+++ b/examples/11-transient-0/output/rust/src/gen/transient_0.rs
diff --git a/examples/10-transient-0/output/rust/src/lib.rs b/examples/11-transient-0/output/rust/src/lib.rs
index e31e1fb..e31e1fb 100644
--- a/examples/10-transient-0/output/rust/src/lib.rs
+++ b/examples/11-transient-0/output/rust/src/lib.rs
diff --git a/examples/10-transient-0/output/rust/src/transient_0.rs b/examples/11-transient-0/output/rust/src/transient_0.rs
index 8b2b800..8b2b800 100644
--- a/examples/10-transient-0/output/rust/src/transient_0.rs
+++ b/examples/11-transient-0/output/rust/src/transient_0.rs
diff --git a/examples/10-transient-0/src/data.hob b/examples/11-transient-0/src/data.hob
index bbfd882..bbfd882 100644
--- a/examples/10-transient-0/src/data.hob
+++ b/examples/11-transient-0/src/data.hob
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
index 89da3ac..d5bbf56 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCompiler.java
@@ -55,6 +55,7 @@ public class HobgoblinCompiler {
         typeCheckerContext.addNativeType(NativeTypes.STRING);
         typeCheckerContext.addNativeTypeConstructor(NativeTypes.LIST);
         typeCheckerContext.addNativeTypeConstructor(NativeTypes.OPTION);
+        typeCheckerContext.addNativeTypeConstructor(NativeTypes.SHARED);
 
         for (var untypedNamespaceNode : sortUntypedNamespaceNodes(untypedNamespaceNodes)) {
             var typedNamespaceNode = TypeChecker.typeCheckNamespace(untypedNamespaceNode, typeCheckerContext);
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/builtins/NativeTypes.java b/src/main/java/org/zwobble/hobgoblin/compiler/builtins/NativeTypes.java
index 7d03a91..8f96709 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/builtins/NativeTypes.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/builtins/NativeTypes.java
@@ -25,4 +25,11 @@ public class NativeTypes {
         List.of(new TypeParam("T")),
         OPTION_INNER
     );
+
+    public static final SimpleNativeType SHARED_INNER = SimpleNativeType.builtin("Shared");
+
+    public static TypeConstructor<SimpleNativeType> SHARED = new TypeConstructor<>(
+        List.of(new TypeParam("T")),
+        SHARED_INNER
+    );
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/java/JavaGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/java/JavaGenerator.java
index 46646d5..1325149 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/java/JavaGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/java/JavaGenerator.java
@@ -1,5 +1,6 @@
 package org.zwobble.hobgoblin.compiler.output.generators.java;
 
+import org.zwobble.hobgoblin.compiler.builtins.NativeTypes;
 import org.zwobble.hobgoblin.compiler.output.lang.java.JavaWriter;
 import org.zwobble.hobgoblin.compiler.output.lang.java.ast.*;
 import org.zwobble.hobgoblin.compiler.types.*;
@@ -143,7 +144,7 @@ public class JavaGenerator {
     }
 
     private JavaTypeRef generateTypeRef(Type type, boolean referenceType) {
-        return switch (type) {
+        return switch (collapseType(type)) {
             case ConstructedNativeType constructedNativeType -> {
                 var innerTypeRef = generateTypeRef(
                     constructedNativeType.constructor().genericType(),
@@ -199,4 +200,16 @@ public class JavaGenerator {
                 throw new UnsupportedOperationException("TODO");
         };
     }
+
+    public Type collapseType(Type type) {
+        if (!(type instanceof ConstructedNativeType constructedNativeType)) {
+            return type;
+        }
+
+        if (!constructedNativeType.constructor().equals(NativeTypes.SHARED)) {
+            return type;
+        }
+
+        return constructedNativeType.args().getFirst();
+    }
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
index 2a2c7ca..62c73ff 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/javatypes/JavaTypesGenerator.java
@@ -215,13 +215,15 @@ public class JavaTypesGenerator implements Generator {
         var javaFieldName = generateFieldName(field.name());
         var withMethodName = generateFieldName("with" + lowerCamelCaseToUpperCamelCase(field.name()));
 
+        var fieldType = this.javaGenerator.collapseType(field.type().value());
+
         methods.add(new JavaMethodDeclaration(
             withMethodName,
             JavaVisibility.PUBLIC,
             JavaMemberKind.INSTANCE,
             builderJavaTypeRef,
             List.of(
-                new JavaParam(generateTypeRef(field.type(), context), javaFieldName)
+                new JavaParam(generateTypeRef(fieldType, context), javaFieldName)
             ),
             List.of(),
             new JavaBlock(List.of(
@@ -232,7 +234,7 @@ public class JavaTypesGenerator implements Generator {
             ))
         ));
 
-        var fieldBuilderTypeRef = generateBuilderTypeRef(field.type().value());
+        var fieldBuilderTypeRef = generateBuilderTypeRef(fieldType);
 
         if (fieldBuilderTypeRef.isPresent()) {
             methods.add(new JavaMethodDeclaration(
@@ -260,7 +262,7 @@ public class JavaTypesGenerator implements Generator {
         }
 
         if (
-            field.type().value() instanceof ConstructedNativeType fieldConstructedNativeType &&
+            fieldType instanceof ConstructedNativeType fieldConstructedNativeType &&
             fieldConstructedNativeType.constructor().equals(NativeTypes.LIST)
         ) {
             var elementType = fieldConstructedNativeType.args().getFirst();
@@ -340,7 +342,7 @@ public class JavaTypesGenerator implements Generator {
         }
 
         if (
-            field.type().value() instanceof ConstructedNativeType fieldConstructedNativeType &&
+            fieldType instanceof ConstructedNativeType fieldConstructedNativeType &&
             fieldConstructedNativeType.constructor().equals(NativeTypes.OPTION)
         ) {
             var elementType = fieldConstructedNativeType.args().getFirst();
@@ -506,7 +508,7 @@ public class JavaTypesGenerator implements Generator {
     }
 
     private JavaExpression arbitraryValue(Type type, Context context) {
-        return switch (type) {
+        return switch (this.javaGenerator.collapseType(type)) {
             case ConstructedNativeType constructedNativeType -> {
                 yield arbitraryValue(constructedNativeType.constructor().genericType(), context);
             }