diff --git a/lang/README.md b/lang/README.md
index 4c0f1a0..f3f0cea 100644
--- a/lang/README.md
+++ b/lang/README.md
@@ -447,7 +447,7 @@ main := fn(): uint {
 	return @inline(foo.foo)
 }
 
-$sum := fn(a: @any(), b: @TypeOf(a)): @TypeOf(a) return a + b
+$sum := fn(a: @Any(), b: @TypeOf(a)): @TypeOf(a) return a + b
 
 // in module: foo.hb
 
@@ -473,6 +473,7 @@ arbitrary text
 - `@inline(<func>, ...<args>)`: equivalent to `<func>(...<args>)` but function is guaranteed to inline, compiler will otherwise never inline
 - `@len(<ty>)`: reports a length of the type of indexing purposes or length ot a string constant
 - `@kindof(<ty>)`: gives an u8 integer describing the kind of type as an index to array `[Builtin, Struct, Enum, Union, Ptr, Slice, Opt, Func, Template, Global, Const, Module]`
+- `@Any()`: generic parameter based on inference, TBD: this will ake arguments in the future that restrict what is accepted
 
 #### c_strings
 ```hb
diff --git a/lang/src/son.rs b/lang/src/son.rs
index af5aefe..99542c7 100644
--- a/lang/src/son.rs
+++ b/lang/src/son.rs
@@ -2862,7 +2862,16 @@ impl<'a> Codegen<'a> {
             self.tys.tmp.args.push(ty);
             let sym = parser::find_symbol(&fast.symbols, carg.id);
             let ty = if ty == ty::Id::ANY_TYPE {
-                todo!()
+                let ty = self.infer_type(arg);
+                *self.tys.tmp.args.last_mut().unwrap() = ty;
+                self.ci.scope.vars.push(Variable::new(
+                    carg.id,
+                    ty,
+                    false,
+                    NEVER,
+                    &mut self.ci.nodes,
+                ));
+                continue;
             } else if sym.flags & idfl::COMPTIME == 0 {
                 // FIXME: could fuck us
                 continue;
@@ -2872,7 +2881,7 @@ impl<'a> Codegen<'a> {
                         arg.pos(),
                         fa!(
                             "arbitrary comptime types are not supported yet \
-                                (expected '{}' got '{}')",
+                            (expected '{}' got '{}')",
                             self.ty_display(ty::Id::TYPE),
                             self.ty_display(ty)
                         ),
diff --git a/lang/tests/son_tests_die.txt b/lang/tests/son_tests_die.txt
index 253b7cd..c33c8e2 100644
--- a/lang/tests/son_tests_die.txt
+++ b/lang/tests/son_tests_die.txt
@@ -1,5 +1,11 @@
-main:
+fun:
     UN 
-code size: 9
+main:
+    ADDI64 r254, r254, -8d
+    ST r31, r254, 0a, 8h
+    JAL r31, r0, :fun
+    LD r31, r254, 0a, 8h
+    ADDI64 r254, r254, 8d
+code size: 64
 ret: 0
 status: Err(Unreachable)