Resolves #102.

src/tink/web/macros/Arguments.hx

@@ -55,14 +55,25 @@ class Arguments {
       case [true, None]:
         ATCapture;
       case [false, None]:
-        if(!optional) {
-          pos.error('`${stringifyArgAccess(access)}` is not used. Please specify its use with the @:params metadata or capture it in the route paths');
-        } else {
+        if(!optional)
+          tryQuery(paths, access, pos);
+        else
           ATCapture;
-        }
     }
   }
 
+  static function tryQuery(paths:Paths, access:ArgAccess, pos:Position) {
+    var access = stringifyArgAccess(access);
+    for (p in paths)
+      if (!Lambda.exists(p.query, v -> switch v {
+        case PCapture(v): stringifyArgAccess(v) == access;
+        case PConst(_): false;
+      }))
+        p.pos.error('${p.expr.toString()} does not capture required parameter `$access`. Please specify its use with the @:params metadata or capture it.');
+
+    return ATCapture;
+  }
+
   static function stringifyArgAccess(access:ArgAccess) {
     return switch access {
       case Plain(name): name;

tests/Fake.hx

@@ -53,6 +53,10 @@ class Fake {
   @:post public function textual(body:String)
     return body;
 
+  @:get('/queryParam?param=$value')
+  public function queryParam(value:String)
+    return { value: value };
+
   @:produces('foo')
   @:post public function streamingFoo(body:RealSource)
     return body;
@@ -163,7 +167,7 @@ class Fake {
 
   @:post public function post(body: { foo:String, bar: Int })
     return body;
-  
+
   @:post public function optional(body: { foo:String, ?bar: Int })
     return {bar:body.bar};
 

tests/ProxyTest.hx

@@ -216,6 +216,12 @@ class ProxyTest {
     var r = new tink.web.proxy.Remote<Issue47>(null, null);
     return asserts.done();
   }
+
+  public function issue109()
+    return
+      proxy.queryParam('foobar').next(
+        recv -> assert(recv.value == 'foobar')
+      );
 }
 
 interface Issue79Base<T> {