BUG #6436: ecpg processed wrong variable name for host value of struct at EXEC SQL INSERT

The following bug has been logged on the website:

Bug reference: 6436
Logged by: Atsushi Tanaka
Email address: a(dot)tanaka77(at)gmail(dot)com
PostgreSQL version: 9.1.2
Operating system: CentOS 6.2
Description:

I tried preprocess my program source by ecpg.
Then, ecpg processed wrong variable name for host value of struct.

variable definition:
----------
EXEC SQL BEGIN DECLARE SECTION;
struct _save_data {
varchar vstring[256];
int idx;
} save_data;
EXEC SQL END DECLARE SECTION;
----------

call EXEC SQL:
----------
EXEC SQL INSERT INTO test_tbl ( title ) VALUES ( :save_data.vstring );
----------

wrong preprocessed line:
----------
ECPGt_varchar,&(save_data.vstring),(long)256,(long)1,sizeof(struct
varchar_save_data.vstring_1),
----------

correct:
----------
ECPGt_varchar,&(save_data.vstring),(long)256,(long)1,sizeof(struct
varchar_vstring_1),
----------