1 files changed, 32 insertions, 0 deletions
diff --git a/pkg/lang/vm/code/errors.go b/pkg/lang/vm/code/errors.go
new file mode 100644
index 0000000..3261dd9
--- /dev/null
+++ b/pkg/lang/vm/code/errors.go
@@ -0,0 +1,32 @@
+package code
+
+import "fmt"
+
+type ErrBuilderAppendMarkerDefinitionClash struct {
+	Marker   Marker
+	ParentPc int
+	ChildPc  int
+}
+
+func (e ErrBuilderAppendMarkerDefinitionClash) Error() string {
+	return fmt.Sprintf("parent and child builder definitions for marker '%v' clash (parent: %d, child: %d)", e.Marker, e.ParentPc, e.ChildPc)
+}
+
+type ErrBuilderUnfulfilledMarker struct {
+	Marker Marker
+	Pc     int
+}
+
+func (e ErrBuilderUnfulfilledMarker) Error() string {
+	return fmt.Sprintf("encountered unfulfilled marker '%v' at pc %d", e.Marker, e.Pc)
+}
+
+type ErrBuilderOverwrittenMarkerReference struct {
+	Marker          Marker
+	Pc              int
+	UnexpectedValue uint64
+}
+
+func (e ErrBuilderOverwrittenMarkerReference) Error() string {
+	return fmt.Sprintf("marker reference for marker '%v' at pc %d was overwritten (value: %x)", e.Marker, e.Pc, e.UnexpectedValue)
+}