fix: restore iota blocks, asm --format flag and prose after the syntax pass

format/format.go

@@ -16,7 +16,7 @@ import (
 )
 
 // Source returns the canonical formatting of src.
-func Source(path, src string) string {
+func Source(src string) string {
 	lines := splitLines(lexer.Tokenize(src))
 
 	// First pass: classify each line and record, for every instruction, the