fix(yew-router-macro): reject old :param and *param route syntax

Under matchit, the old route-recognizer syntax silently becomes literal
path segments, causing routes to never match. Emit a compile-time error
with a suggested fix instead.

Author: Madoshakalaka

packages/yew-router-macro/src/routable_derive.rs

@@ -120,6 +120,29 @@ fn parse_variants_attributes(
             ));
         }
 
+        // Reject old route-recognizer `:param` / `*param` syntax that would
+        // silently become literal path segments under matchit.
+        for segment in val.split('/') {
+            if let Some(name) = segment.strip_prefix(':') {
+                return Err(syn::Error::new_spanned(
+                    &lit,
+                    format!(
+                        "route segments must not start with `:`. Use `{{{name}}}` to capture a \
+                         parameter.",
+                    ),
+                ));
+            }
+            if let Some(name) = segment.strip_prefix('*') {
+                return Err(syn::Error::new_spanned(
+                    &lit,
+                    format!(
+                        "route segments must not start with `*`. Use `{{*{name}}}` to capture a \
+                         wildcard.",
+                    ),
+                ));
+            }
+        }
+
         let route_params = extract_route_params(&val);
         if !route_params.is_empty() {
             let field_names: std::collections::HashSet<String> = match &variant.fields {

packages/yew-router-macro/tests/routable_derive/old-param-syntax-fail.rs

@@ -0,0 +1,11 @@
+#[derive(yew_router::Routable, Debug, Clone, PartialEq)]
+enum Routes {
+    #[at("/")]
+    Home,
+    #[at("/posts/:id")]
+    Post { id: u32 },
+    #[at("/files/*path")]
+    File { path: String },
+}
+
+fn main() {}

packages/yew-router-macro/tests/routable_derive/old-param-syntax-fail.stderr

@@ -0,0 +1,5 @@
+error: route segments must not start with `:`. Use `{id}` to capture a parameter.
+ --> tests/routable_derive/old-param-syntax-fail.rs:5:10
+  |
+5 |     #[at("/posts/:id")]
+  |          ^^^^^^^^^^^^