codegen: prevent name duplication in Rust or Rhai

codegen/ui_tests/rhai_fn_rename_collision.rs

@@ -0,0 +1,33 @@
+use rhai::plugin::*;
+
+#[derive(Clone)]
+pub struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[export_module]
+pub mod test_module {
+    pub use super::Point;
+    #[rhai_fn(name = "foo")]
+    pub fn test_fn(input: Point) -> bool {
+        input.x > input.y
+    }
+
+    #[rhai_fn(name = "foo")]
+    pub fn test_fn_2(input: Point) -> bool {
+        input.x < input.y
+    }
+}
+
+fn main() {
+    let n = Point {
+        x: 0.0,
+        y: 10.0,
+    };
+    if test_module::test_fn(n) {
+        println!("yes");
+    } else {
+        println!("no");
+    }
+}

codegen/ui_tests/rhai_fn_rename_collision.stderr

@@ -0,0 +1,17 @@
+error: duplicate Rhai signature for 'foo'
+  --> $DIR/rhai_fn_rename_collision.rs:17:15
+   |
+17 |     #[rhai_fn(name = "foo")]
+   |               ^^^^^^^^^^^^
+
+error: duplicated function renamed 'foo'
+  --> $DIR/rhai_fn_rename_collision.rs:12:15
+   |
+12 |     #[rhai_fn(name = "foo")]
+   |               ^^^^^^^^^^^^
+
+error[E0433]: failed to resolve: use of undeclared type or module `test_module`
+  --> $DIR/rhai_fn_rename_collision.rs:28:8
+   |
+28 |     if test_module::test_fn(n) {
+   |        ^^^^^^^^^^^ use of undeclared type or module `test_module`

codegen/ui_tests/rhai_fn_rename_collision_oneattr.rs

@@ -0,0 +1,32 @@
+use rhai::plugin::*;
+
+#[derive(Clone)]
+pub struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[export_module]
+pub mod test_module {
+    pub use super::Point;
+    #[rhai_fn(name = "foo")]
+    pub fn test_fn(input: Point) -> bool {
+        input.x > input.y
+    }
+
+    pub fn foo(input: Point) -> bool {
+        input.x < input.y
+    }
+}
+
+fn main() {
+    let n = Point {
+        x: 0.0,
+        y: 10.0,
+    };
+    if test_module::test_fn(n) {
+        println!("yes");
+    } else {
+        println!("no");
+    }
+}

codegen/ui_tests/rhai_fn_rename_collision_oneattr.stderr

@@ -0,0 +1,17 @@
+error: duplicate Rhai signature for 'foo'
+  --> $DIR/rhai_fn_rename_collision_oneattr.rs:12:15
+   |
+12 |     #[rhai_fn(name = "foo")]
+   |               ^^^^^^^^^^^^
+
+error: duplicated function 'foo'
+  --> $DIR/rhai_fn_rename_collision_oneattr.rs:17:12
+   |
+17 |     pub fn foo(input: Point) -> bool {
+   |            ^^^
+
+error[E0433]: failed to resolve: use of undeclared type or module `test_module`
+  --> $DIR/rhai_fn_rename_collision_oneattr.rs:27:8
+   |
+27 |     if test_module::test_fn(n) {
+   |        ^^^^^^^^^^^ use of undeclared type or module `test_module`