fix: empty records crashing code gen closes #728

crates/aiken-lang/src/parser/definition/data_type.rs

@@ -54,7 +54,16 @@ pub fn parser() -> impl Parser<Token, ast::UntypedDefinition, Error = ParseError
             |(((public, opaque), (name, parameters)), constructors), span| {
                 ast::UntypedDefinition::DataType(ast::DataType {
                     location: span,
-                    constructors: constructors
+                    constructors: if constructors.is_empty() {
+                        vec![ast::RecordConstructor {
+                            location: span,
+                            arguments: vec![],
+                            doc: None,
+                            name: name.clone(),
+                            sugar: true,
+                        }]
+                    } else {
+                        constructors
                             .into_iter()
                             .map(|mut constructor| {
                                 if constructor.sugar {
@@ -63,7 +72,8 @@ pub fn parser() -> impl Parser<Token, ast::UntypedDefinition, Error = ParseError
 
                                 constructor
                             })
-                        .collect(),
+                            .collect()
+                    },
                     doc: None,
                     name,
                     opaque,
@@ -119,4 +129,25 @@ mod tests {
             "#
         );
     }
+
+    #[test]
+    fn record_sugar() {
+        assert_definition!(
+            r#"
+            pub type Foo {
+              wow: Int,
+            }
+            "#
+        );
+    }
+
+    #[test]
+    fn empty_record_sugar() {
+        assert_definition!(
+            r#"
+            pub type Foo {
+            }
+            "#
+        );
+    }
 }

crates/aiken-lang/src/parser/definition/snapshots/empty_record_sugar.snap

@@ -0,0 +1,24 @@
+---
+source: crates/aiken-lang/src/parser/definition/data_type.rs
+description: "Code:\n\npub type Foo {\n}\n"
+---
+DataType(
+    DataType {
+        constructors: [
+            RecordConstructor {
+                location: 0..16,
+                name: "Foo",
+                arguments: [],
+                doc: None,
+                sugar: true,
+            },
+        ],
+        doc: None,
+        location: 0..16,
+        name: "Foo",
+        opaque: false,
+        parameters: [],
+        public: true,
+        typed_parameters: [],
+    },
+)

crates/aiken-lang/src/parser/definition/snapshots/record_sugar.snap

@@ -0,0 +1,39 @@
+---
+source: crates/aiken-lang/src/parser/definition/data_type.rs
+description: "Code:\n\npub type Foo {\n  wow: Int,\n}\n"
+---
+DataType(
+    DataType {
+        constructors: [
+            RecordConstructor {
+                location: 13..28,
+                name: "Foo",
+                arguments: [
+                    RecordConstructorArg {
+                        label: Some(
+                            "wow",
+                        ),
+                        annotation: Constructor {
+                            location: 22..25,
+                            module: None,
+                            name: "Int",
+                            arguments: [],
+                        },
+                        location: 17..25,
+                        tipo: (),
+                        doc: None,
+                    },
+                ],
+                doc: None,
+                sugar: true,
+            },
+        ],
+        doc: None,
+        location: 0..28,
+        name: "Foo",
+        opaque: false,
+        parameters: [],
+        public: true,
+        typed_parameters: [],
+    },
+)