more info on yaml errors

print yaml's 'problem'

lib/ansible/errors/yaml_strings.py

@@ -31,7 +31,7 @@ __all__ = [
 
 YAML_SYNTAX_ERROR = """\
 Syntax Error while loading YAML.
-"""
+  %s"""
 
 YAML_POSITION_DETAILS = """\
 The error appears to have been in '%s': line %s, column %s, but may

lib/ansible/parsing/dataloader.py

@@ -225,7 +225,9 @@ class DataLoader:
             err_obj = AnsibleBaseYAMLObject()
             err_obj.ansible_pos = (file_name, yaml_exc.problem_mark.line + 1, yaml_exc.problem_mark.column + 1)
 
-        raise AnsibleParserError(YAML_SYNTAX_ERROR, obj=err_obj, show_content=show_content, orig_exc=yaml_exc)
+        err_msg = getattr(yaml_exc, 'problem', '')
+
+        raise AnsibleParserError(YAML_SYNTAX_ERROR % to_native(err_msg), obj=err_obj, show_content=show_content, orig_exc=yaml_exc)
 
     def get_basedir(self):
         ''' returns the current basedir '''