Improved instruction parser

src/build/token/Token.go

@@ -1,5 +1,7 @@
 package token
 
+import "fmt"
+
 // Token represents a single element in a source file.
 // The characters that make up an identifier are grouped into a single token.
 // This makes parsing easier and allows us to do better syntax checks.
@@ -9,6 +11,11 @@ type Token struct {
 	Bytes    []byte
 }
 
+// String creates a human readable representation for debugging purposes.
+func (t Token) String() string {
+	return fmt.Sprintf("%s %s", t.Kind, t.Text())
+}
+
 // Text returns the token text.
 func (t Token) Text() string {
 	return string(t.Bytes)