Fixed a bug in continuous read of target files; ref #4138

Line number information in a compiled file was wrong.

mrbgems/mruby-compiler/core/codegen.c

@@ -156,7 +156,10 @@ emit_B(codegen_scope *s, uint32_t pc, uint8_t i)
     }
   }
   if (s->lines) {
+    if (s->lineno > 0 || pc == 0)
       s->lines[pc] = s->lineno;
+    else
+      s->lines[pc] = s->lines[pc-1];
   }
   s->iseq[pc] = i;
 }

mrbgems/mruby-compiler/core/parse.y

@@ -133,6 +133,10 @@ cons_gen(parser_state *p, node *car, node *cdr)
   c->cdr = cdr;
   c->lineno = p->lineno;
   c->filename_index = p->current_filename_index;
+  /* beginning of next partial file; need to point the previous file */
+  if (p->lineno == 0 && p->current_filename_index > 0) {
+    c->filename_index-- ;
+  }
   return c;
 }
 #define cons(a,b) cons_gen(p,(a),(b))