export_fn: add return_raw attribute

codegen/ui_tests/export_fn_bad_attr.rs

@@ -6,7 +6,7 @@ struct Point {
     y: f32,
 }
 
-#[export_fn(unknown = true)]
+#[export_fn(unknown = "thing")]
 pub fn test_fn(input: Point) -> bool {
     input.x > input.y
 }

codegen/ui_tests/export_fn_bad_attr.stderr

@@ -1,7 +1,7 @@
 error: unknown attribute 'unknown'
  --> $DIR/export_fn_bad_attr.rs:9:13
   |
-9 | #[export_fn(unknown = true)]
+9 | #[export_fn(unknown = "thing")]
   |             ^^^^^^^
 
 error[E0425]: cannot find function `test_fn` in this scope

codegen/ui_tests/export_fn_bad_value.stderr

@@ -1,4 +1,4 @@
-error: expecting string literal value
+error: expecting string literal
  --> $DIR/export_fn_bad_value.rs:9:20
   |
 9 | #[export_fn(name = true)]

codegen/ui_tests/export_fn_extra_value.rs

@@ -0,0 +1,24 @@
+use rhai::plugin::*;
+
+#[derive(Clone)]
+struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[export_fn(return_raw = "yes")]
+pub fn test_fn(input: Point) -> bool {
+    input.x > input.y
+}
+
+fn main() {
+    let n = Point {
+        x: 0.0,
+        y: 10.0,
+    };
+    if test_fn(n) {
+        println!("yes");
+    } else {
+        println!("no");
+    }
+}

codegen/ui_tests/export_fn_extra_value.stderr

@@ -0,0 +1,11 @@
+error: extraneous value
+ --> $DIR/export_fn_extra_value.rs:9:26
+  |
+9 | #[export_fn(return_raw = "yes")]
+  |                          ^^^^^
+
+error[E0425]: cannot find function `test_fn` in this scope
+  --> $DIR/export_fn_extra_value.rs:19:8
+   |
+19 |     if test_fn(n) {
+   |        ^^^^^^^ not found in this scope

codegen/ui_tests/export_fn_junk_arg.stderr

@@ -1,4 +1,4 @@
-error: expected assignment expression
+error: expecting identifier
  --> $DIR/export_fn_junk_arg.rs:9:13
   |
 9 | #[export_fn("wheeeee")]

codegen/ui_tests/export_fn_missing_value.rs

@@ -0,0 +1,24 @@
+use rhai::plugin::*;
+
+#[derive(Clone)]
+struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[export_fn(name)]
+pub fn test_fn(input: Point) -> bool {
+    input.x > input.y
+}
+
+fn main() {
+    let n = Point {
+        x: 0.0,
+        y: 10.0,
+    };
+    if test_fn(n) {
+        println!("yes");
+    } else {
+        println!("no");
+    }
+}

codegen/ui_tests/export_fn_missing_value.stderr

@@ -0,0 +1,11 @@
+error: requires value
+ --> $DIR/export_fn_missing_value.rs:9:13
+  |
+9 | #[export_fn(name)]
+  |             ^^^^
+
+error[E0425]: cannot find function `test_fn` in this scope
+  --> $DIR/export_fn_missing_value.rs:19:8
+   |
+19 |     if test_fn(n) {
+   |        ^^^^^^^ not found in this scope

codegen/ui_tests/export_fn_path_attr.rs

@@ -0,0 +1,24 @@
+use rhai::plugin::*;
+
+#[derive(Clone)]
+struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[export_fn(rhai::name = "thing")]
+pub fn test_fn(input: Point) -> bool {
+    input.x > input.y
+}
+
+fn main() {
+    let n = Point {
+        x: 0.0,
+        y: 10.0,
+    };
+    if test_fn(n) {
+        println!("yes");
+    } else {
+        println!("no");
+    }
+}

codegen/ui_tests/export_fn_path_attr.stderr

@@ -0,0 +1,11 @@
+error: expecting attribute name
+ --> $DIR/export_fn_path_attr.rs:9:13
+  |
+9 | #[export_fn(rhai::name = "thing")]
+  |             ^^^^^^^^^^
+
+error[E0425]: cannot find function `test_fn` in this scope
+  --> $DIR/export_fn_path_attr.rs:19:8
+   |
+19 |     if test_fn(n) {
+   |        ^^^^^^^ not found in this scope