build-sys: use local asciigoat.org/core [DO-NOT-MERGE]

Signed-off-by: Alejandro Mery <amery@jpi.io>

parser/lexer.go

@@ -1,8 +1,6 @@
 package parser
 
 import (
-	"log"
-
 	"asciigoat.org/core/lexer"
 )
 
@@ -20,8 +18,7 @@ func (p *Parser) lexStart() (lexer.StateFn, error) {
 		switch {
 		case err != nil:
 			// read error
-			log.Printf("%s: %s: %s", p.pos, "error", err)
-			return nil, err
+			return p.emitError("", err)
 		case IsNewLine(r):
 			// new line
 			p.lexNewLine(r)