diff --git a/cl/expr.go b/cl/expr.go
index 15356c2ef..53f849aeb 100644
--- a/cl/expr.go
+++ b/cl/expr.go
@@ -202,7 +202,7 @@ func compileExprLHS(ctx *blockCtx, expr ast.Expr) {
 	case *ast.StarExpr:
 		compileStarExprLHS(ctx, v)
 	default:
-		log.Panicln("compileExpr failed: unknown -", reflect.TypeOf(v))
+		ctx.handleErrorf(v.Pos(), "compileExprLHS unexpected: %T", v)
 	}
 	if rec := ctx.recorder(); rec != nil {
 		rec.recordExpr(ctx, expr, true)
@@ -275,12 +275,8 @@ func compileExpr(ctx *blockCtx, expr ast.Expr, inFlags ...int) {
 		compileErrWrapExpr(ctx, v, 0)
 	case *ast.FuncType:
 		ctx.cb.Typ(toFuncType(ctx, v, nil, nil), v)
-	case *ast.Ellipsis:
-		panic("compileEllipsis: ast.Ellipsis unexpected")
-	case *ast.KeyValueExpr:
-		panic("compileExpr: ast.KeyValueExpr unexpected")
 	default:
-		log.Panicln("compileExpr failed: unknown -", reflect.TypeOf(v))
+		ctx.handleErrorf(v.Pos(), "compileExpr unexpected: %T", v)
 	}
 	if rec := ctx.recorder(); rec != nil {
 		rec.recordExpr(ctx, expr, false)
@@ -1167,7 +1163,7 @@ func compileErrWrapExpr(ctx *blockCtx, v *ast.ErrWrapExpr, inFlags int) {
 			VarRef(err).
 			Val(pkg.Import(errorPkgPath).Ref("NewFrame")).
 			Val(err).
-			Val(sprintAst(pkg.Fset, v.X)).
+			Val(sprintAst(ctx, pkg.Fset, v.X)).
 			Val(relFile(ctx.relBaseDir, pos.Filename)).
 			Val(pos.Line).
 			Val(currentFuncName).
@@ -1189,13 +1185,12 @@ func compileErrWrapExpr(ctx *blockCtx, v *ast.ErrWrapExpr, inFlags int) {
 	}
 }
 
-func sprintAst(fset *token.FileSet, x ast.Node) string {
+func sprintAst(ctx *blockCtx, fset *token.FileSet, x ast.Node) string {
 	var buf bytes.Buffer
 	err := printer.Fprint(&buf, fset, x)
 	if err != nil {
-		panic("Unexpected error: " + err.Error())
+		ctx.handleErrorf(x.Pos(), "unexpected error: %v", err)
 	}
-
 	return buf.String()
 }
 
diff --git a/cl/func_type_and_var.go b/cl/func_type_and_var.go
index ca8a37f1a..6d195d2a4 100644
--- a/cl/func_type_and_var.go
+++ b/cl/func_type_and_var.go
@@ -21,7 +21,6 @@ import (
 	"go/types"
 	"log"
 	"math/big"
-	"reflect"
 	"strconv"
 
 	"github.com/goplus/gop/ast"
@@ -179,9 +178,10 @@ func toType(ctx *blockCtx, typ ast.Expr) (t types.Type) {
 		return toIndexType(ctx, v)
 	case *ast.IndexListExpr:
 		return toIndexListType(ctx, v)
+	default:
+		ctx.handleErrorf(v.Pos(), "toType unexpected: %T", v)
+		return types.Typ[types.Invalid]
 	}
-	log.Panicln("toType: unknown -", reflect.TypeOf(typ))
-	return nil
 }
 
 var (
diff --git a/cl/stmt.go b/cl/stmt.go
index 2eeec1811..436fb0eca 100644
--- a/cl/stmt.go
+++ b/cl/stmt.go
@@ -21,7 +21,6 @@ import (
 	"go/constant"
 	"log"
 	"path/filepath"
-	"reflect"
 
 	goast "go/ast"
 	gotoken "go/token"
@@ -158,7 +157,7 @@ func compileStmt(ctx *blockCtx, stmt ast.Stmt) {
 	case *ast.EmptyStmt:
 		// do nothing
 	default:
-		log.Panicln("TODO - compileStmt failed: unknown -", reflect.TypeOf(v))
+		ctx.handleErrorf(v.Pos(), "compileStmt unexpected: %T", v)
 	}
 	ctx.cb.EndStmt()
 }