diff --git a/inliner/main.go b/inliner/main.go
index c8cac04..12931ae 100755
--- a/inliner/main.go
+++ b/inliner/main.go
@@ -5,10 +5,13 @@ import (
 	"go/ast"
 	"go/format"
 	"go/token"
+	"io"
 	"os"
+	"strings"
 
 	"golang.org/x/tools/go/ast/astutil"
 	"golang.org/x/tools/go/packages"
+	"golang.org/x/tools/imports"
 )
 
 func printDebugInfo() {
@@ -32,7 +35,12 @@ func main() {
 		panic(err)
 	}
 
-	// Parse package
+	genCogoFuncs(cwd)
+	genHasGenChecksOnOriginalFuncs(cwd)
+}
+
+func genCogoFuncs(cwd string) {
+
 	pkgs, err := packages.Load(&packages.Config{
 		Dir:   cwd,
 		Mode:  packages.NeedName | packages.NeedTypes | packages.NeedTypesInfo | packages.NeedSyntax,
@@ -42,46 +50,104 @@ func main() {
 		panic(err)
 	}
 
-	if len(pkgs) != 1 {
-		panic(fmt.Sprintf("expected to find one package but found %d", len(pkgs)))
-	}
+	// if len(pkgs) != 1 {
+	// 	panic(fmt.Sprintf("expected to find one package but found %d", len(pkgs)))
+	// }
 
-	processPkg(pkgs[0])
+	for _, pkg := range pkgs {
+
+		p := &processor{
+			fset:             pkg.Fset,
+			funcDeclsToWrite: []*ast.FuncDecl{},
+		}
+
+		for i, synFile := range pkg.Syntax {
+
+			pkg.Syntax[i] = astutil.Apply(synFile, p.genCogoFuncsNodeProcessor, nil).(*ast.File)
+
+			if len(p.funcDeclsToWrite) > 0 {
+
+				root := &ast.File{
+					Name:    synFile.Name,
+					Imports: synFile.Imports,
+					Decls:   []ast.Decl{},
+				}
+
+				for _, v := range p.funcDeclsToWrite {
+					root.Decls = append(root.Decls, &ast.FuncDecl{
+						Name: ast.NewIdent(v.Name.Name + "_cogo"),
+						Type: v.Type,
+						Body: v.Body,
+					})
+				}
+
+				origFName := pkg.Fset.File(synFile.Pos()).Name()
+				newFName := strings.Split(origFName, ".")[0] + ".cogo.go"
+				writeAst(newFName, pkg.Fset, root)
+
+				p.funcDeclsToWrite = p.funcDeclsToWrite[:0]
+			}
+		}
+	}
 }
 
-func processPkg(pkg *packages.Package) {
+func writeAst(fName string, fset *token.FileSet, node any) {
 
-	p := processor{
-		fset:             pkg.Fset,
-		funcDeclsToWrite: []*ast.FuncDecl{},
+	f, err := os.Create(fName)
+	if err != nil {
+		panic("Failed to create file to write new AST. Err: " + err.Error())
 	}
-	for i, synFile := range pkg.Syntax {
+	defer f.Close()
 
-		pkg.Syntax[i] = astutil.Apply(synFile, p.processDeclNode, nil).(*ast.File)
+	err = format.Node(f, fset, node)
+	if err != nil {
+		panic(err.Error())
+	}
 
-		if len(p.funcDeclsToWrite) > 0 {
+	b, err := imports.Process(fName, nil, nil)
+	if err != nil {
+		panic("Failed to process imports on file " + fName + ". Err: " + err.Error())
+	}
 
-			root := &ast.File{
-				Name:    synFile.Name,
-				Imports: synFile.Imports,
-				Decls:   []ast.Decl{},
+	f.Seek(0, io.SeekStart)
+	_, err = f.Write(b)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func genHasGenChecksOnOriginalFuncs(cwd string) {
+
+	pkgs, err := packages.Load(&packages.Config{
+		Dir:   cwd,
+		Mode:  packages.NeedName | packages.NeedTypes | packages.NeedTypesInfo | packages.NeedSyntax,
+		Tests: false,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	// if len(pkgs) != 1 {
+	// 	panic(fmt.Sprintf("expected to find one package but found %d", len(pkgs)))
+	// }
+
+	for _, pkg := range pkgs {
+
+		p := &processor{
+			fset:             pkg.Fset,
+			funcDeclsToWrite: []*ast.FuncDecl{},
+		}
+
+		for i, synFile := range pkg.Syntax {
+
+			pkg.Syntax[i] = astutil.Apply(synFile, p.genHasGenChecksOnOriginalFuncsNodeProcessor, nil).(*ast.File)
+
+			if len(p.funcDeclsToWrite) > 0 {
+				origFName := pkg.Fset.File(synFile.Pos()).Name()
+				writeAst(origFName, pkg.Fset, pkg.Syntax[i])
+
+				p.funcDeclsToWrite = p.funcDeclsToWrite[:0]
 			}
-
-			for _, v := range p.funcDeclsToWrite {
-				root.Decls = append(root.Decls, &ast.FuncDecl{
-					Name: ast.NewIdent(v.Name.Name + "_cogo"),
-					Type: v.Type,
-					Body: v.Body,
-				})
-			}
-
-			// imports.Process()
-			err := format.Node(os.Stdout, pkg.Fset, root)
-			if err != nil {
-				panic(err.Error())
-			}
-
-			p.funcDeclsToWrite = p.funcDeclsToWrite[:0]
 		}
 	}
 
@@ -92,7 +158,7 @@ type processor struct {
 	funcDeclsToWrite []*ast.FuncDecl
 }
 
-func (p *processor) processDeclNode(c *astutil.Cursor) bool {
+func (p *processor) genCogoFuncsNodeProcessor(c *astutil.Cursor) bool {
 
 	n := c.Node()
 	if n == nil {
@@ -226,6 +292,45 @@ func (p *processor) processDeclNode(c *astutil.Cursor) bool {
 	return true
 }
 
+func (p *processor) genHasGenChecksOnOriginalFuncsNodeProcessor(c *astutil.Cursor) bool {
+
+	n := c.Node()
+	if n == nil {
+		return false
+	}
+
+	funcDecl, ok := n.(*ast.FuncDecl)
+	if !ok || funcDecl.Body == nil {
+		return true
+	}
+
+	coroutineParamName := getCoroutineParamNameFromFuncDecl(funcDecl)
+	if coroutineParamName == "" || !funcDeclCallsCoroutineBegin(funcDecl, coroutineParamName) {
+		return false
+	}
+
+	for i, stmt := range funcDecl.Body.List {
+
+		// If one already exists update it and return
+		ifStmt, ok := stmt.(*ast.IfStmt)
+		if ok && ifStmtIsHasGen(ifStmt) {
+			funcDecl.Body.List[i] = createHasGenIfStmt(funcDecl, coroutineParamName)
+			p.funcDeclsToWrite = append(p.funcDeclsToWrite, funcDecl)
+			return true
+		}
+	}
+
+	// If the check doesn't exist add it to the beginning of the function
+	origList := funcDecl.Body.List
+	funcDecl.Body.List = make([]ast.Stmt, 0, len(origList)+1)
+	funcDecl.Body.List = append(funcDecl.Body.List, createHasGenIfStmt(funcDecl, coroutineParamName))
+	funcDecl.Body.List = append(funcDecl.Body.List, origList...)
+
+	p.funcDeclsToWrite = append(p.funcDeclsToWrite, funcDecl)
+
+	return true
+}
+
 func createHasGenIfStmt(funcDecl *ast.FuncDecl, coroutineParamName string) *ast.IfStmt {
 	return &ast.IfStmt{
 		Cond: createStmtFromSelFuncCall("cogo", "HasGen").(*ast.ExprStmt).X,
diff --git a/main.go b/main.go
index ba881c6..4851e62 100755
--- a/main.go
+++ b/main.go
@@ -9,14 +9,8 @@ import (
 	"github.com/bloeys/cogo/cogo"
 )
 
-func test_cogo(c *cogo.Coroutine[int, int]) (out int) { return 0 }
-
 func test(c *cogo.Coroutine[int, int]) (out int) {
 
-	if cogo.HasGen() {
-		return test_cogo(c)
-	}
-
 	c.Begin()
 
 	println("Tick 1")