Initial commit

error.go

@@ -0,0 +1,14 @@
+package step
+
+// Error enumerates errors common to this package.
+type Error string; const (
+	ErrCircularInheritance     Error = "Circular inheritance"
+	ErrFrontMatterMalformed    Error = "Front matter is malformed"
+	ErrFrontMatterNeverClosed  Error = "Front matter is never closed"
+	ErrFrontMatterDuplicateKey Error = "Duplicate key in front matter"
+)
+
+// Error fulfills the error interface.
+func (err Error) Error () string {
+	return string(err)
+}