Improve diagnostics for duplicated names

diag_test/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "diag_test"
+version = "0.1.0"
+authors = ["J Henry Waugh <jhwgh1968@protonmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[[bin]]
+name = "test_template"
+path = "test_template.rs"
+
+[dependencies]
+rhai = { version = "*", path = ".." }

diag_test/test_template.rs

@@ -0,0 +1,35 @@
+use rhai::plugin::*;
+
+#[derive(Clone)]
+pub struct Point {
+    x: f32,
+    y: f32,
+}
+
+#[export_module]
+pub mod test_module {
+    #[rhai_mod(name = "bar")]
+    pub mod test_mod {
+        #[rhai_fn(name = "foo")]
+        pub fn test_fn(input: Point) -> bool {
+            input.x > input.y
+        }
+
+        #[rhai_fn(return_raw)]
+        pub fn test_fn_raw(input: Point) -> Result<rhai::Dynamic, Box<rhai::EvalAltResult>> {
+            Ok(Dynamic::from(input.x > input.y))
+        }
+    }
+}
+
+fn main() {
+    let n = Point {
+        x: 0.0,
+        y: 10.0,
+    };
+    if test_module::test_mod::test_fn(n) {
+        println!("yes");
+    } else {
+        println!("no");
+    }
+}