diff --git a/Cargo.toml b/Cargo.toml
index 1196dee..0abaee5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,7 +21,7 @@ members = [
   "fir",
   "oir",
   "scir",
-  "datatable",
+  "datatable", "repr",
   ]
 resolver = "2"
 
diff --git a/bootstrap/makefile b/bootstrap/makefile
index 17e328d..0654872 100644
--- a/bootstrap/makefile
+++ b/bootstrap/makefile
@@ -1,5 +1,7 @@
 .ty/token.o:
 	ty obj src/token.ty
 
+.PHONY: clean
 clean:
 	rm -rf .ty
+	mkdir .ty
diff --git a/bootstrap/repr/integration.c b/bootstrap/repr/integration.c
new file mode 100644
index 0000000..f56d4aa
--- /dev/null
+++ b/bootstrap/repr/integration.c
@@ -0,0 +1,6 @@
+#include <stdint.h>
+
+uint64_t add(uint64_t left, uint64_t right) {
+  return left + right;
+}
+
diff --git a/bootstrap/repr/integration.ty b/bootstrap/repr/integration.ty
new file mode 100644
index 0000000..2921c0c
--- /dev/null
+++ b/bootstrap/repr/integration.ty
@@ -0,0 +1,4 @@
+pub const add = fn(x: u64, y: u64) u64 {
+  return x + y
+}
+
diff --git a/bootstrap/repr/main.c b/bootstrap/repr/main.c
new file mode 100644
index 0000000..8736cd7
--- /dev/null
+++ b/bootstrap/repr/main.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <stdint.h>
+
+extern uint64_t add(uint64_t, uint64_t);
+
+int main() {
+  printf("Hello");
+  printf("Hello %lu", add(2, 7));
+  puts("Hello");
+}
diff --git a/bootstrap/repr/makefile b/bootstrap/repr/makefile
new file mode 100644
index 0000000..3ab941f
--- /dev/null
+++ b/bootstrap/repr/makefile
@@ -0,0 +1,25 @@
+all: .ty/main.o .ty/integrationc.o .ty/integration.o .ty/repr-37b621cda8f778ea.repr.c0ded12167d2f276-cgu.0.rcgu.o
+	cd .ty && objdump -D integrationc.o > integrationc.o.txt
+	cd .ty && objdump -D integration.o > integrationty.o.txt
+	cd .ty && objdump -D repr-37b621cda8f778ea.repr.c0ded12167d2f276-cgu.0.rcgu.o > integrationrs.o.txt
+	touch .ty/all
+
+.ty/main.o: main.c
+	cc -c main.c -o .ty/main.o -O3
+
+.ty/integrationc.o: integration.c
+	cc -c integration.c -o .ty/integrationc.o -O3
+
+.ty/integration.o: integration.ty
+	ty obj integration.ty
+
+.ty/repr-37b621cda8f778ea.repr.c0ded12167d2f276-cgu.0.rcgu.o: ../../target/release/librepr.rlib
+	cd .ty && ar x ../../../target/release/librepr.rlib
+
+../../target/release/librepr.rlib: ../../repr/src/lib.rs
+	cd ../.. && cargo build -p repr --release
+
+.PHONY: clean
+clean:
+	rm -rf .ty
+	mkdir .ty
diff --git a/fir/src/lib.rs b/fir/src/lib.rs
index 36c7606..0ad10a5 100644
--- a/fir/src/lib.rs
+++ b/fir/src/lib.rs
@@ -45,17 +45,27 @@ impl Fir {
         type_tables: &Vec<TypeTable>,
         oir: &mut Oir,
     ) -> Function {
-        let mut sig = Signature::new(CallConv::SystemV);
+        let sig = Signature::new(CallConv::Cold);
         let name = UserFuncName::user(namespace, index);
         // todo:: types need to be worked out, params and returns defined
-        func_def
-            .args
-            .iter()
-            .for_each(|_x| sig.params.push(AbiParam::new(I64)));
-        sig.returns.push(AbiParam::new(I64));
         let mut func = Function::with_name_signature(name, sig);
         let mut builder = FunctionBuilder::new(&mut func, ctx);
         let root_block = builder.create_block();
+        func_def.args.iter().for_each(|x| {
+            let z = self
+                .recurse(
+                    x.as_ref().as_ref(),
+                    &mut builder,
+                    dtbl,
+                    scopes,
+                    type_tables,
+                    oir,
+                )
+                .unwrap();
+            builder.func.signature.params.push(AbiParam::new(I64));
+            //let res = builder.block_params(root_block)[z.as_u32() as usize];
+        });
+        builder.func.signature.returns.push(AbiParam::new(I64));
         builder.append_block_params_for_function_params(root_block);
         builder.switch_to_block(root_block);
         let _result = self.recurse(
@@ -70,6 +80,19 @@ impl Fir {
         builder.finalize();
         func
     }
+    pub fn handle_arg_init(
+        &mut self,
+        op: &SymbolInit,
+        builder: &mut FunctionBuilder,
+        dtbl: &DataTable,
+        scopes: &Vec<ScopeTable>,
+        type_tables: &Vec<TypeTable>,
+        oir: &mut Oir,
+    ) -> ResultFir<Variable> {
+        let result = self.add_var();
+        self.sym.table.insert(op.ident.clone(), result.as_u32());
+        Ok(result)
+    }
     pub fn handle_const_init(
         &mut self,
         op: &Initialization,
@@ -265,6 +288,9 @@ impl Fir {
             TypeTree::ConstInit(op) => {
                 self.handle_const_init(&op, builder, dtbl, scopes, type_tables, oir)
             }
+            TypeTree::ArgInit(op) => {
+                self.handle_arg_init(&op, builder, dtbl, scopes, type_tables, oir)
+            }
             TypeTree::SymbolAccess(op) => {
                 self.handle_sym_access(&op, dtbl, scopes, type_tables, oir, builder)
             }
diff --git a/linter/src/lib.rs b/linter/src/lib.rs
index c78a7b1..abfd644 100644
--- a/linter/src/lib.rs
+++ b/linter/src/lib.rs
@@ -1205,7 +1205,21 @@ mod tests {
         );
     }
     #[test]
-    fn it_should_handle_basic_types() {
+    fn it_should_handle_func_args() {
+        const TEST_STR: &'static str = "const add = fn(x: u64, y: u64) u64 { return x + y }
+        ";
+        let lexer = TLexer::new(TEST_STR);
+        let mut parser = Parser::new(lexer);
+        let result = parser.all();
+        let mut tts = vec![];
+        let mut scps = vec![];
+        let mut linter = LintSource::new(TEST_STR, &mut scps, &mut tts);
+        let _ = linter.lint_check(&result.unwrap());
+
+        assert!(linter.issues.len() == 0);
+    }
+    #[test]
+    fn it_should_handle_global_data() {
         const TEST_STR: &'static str = "const val: usize = 2
             const main = fn() void { return 7 + val }
         ";
diff --git a/repr/Cargo.toml b/repr/Cargo.toml
new file mode 100644
index 0000000..62df674
--- /dev/null
+++ b/repr/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "repr"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/repr/src/lib.rs b/repr/src/lib.rs
new file mode 100644
index 0000000..eeead7f
--- /dev/null
+++ b/repr/src/lib.rs
@@ -0,0 +1,15 @@
+#[no_mangle]
+pub extern "C" fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[no_mangle]
+pub fn make_binop(thing: u64, small: char, big: u64) -> BinOp {
+    return BinOp { thing, small, big };
+}
+
+pub struct BinOp {
+    thing: u64,
+    small: char,
+    big: u64,
+}