[BUGS] BUG #14861: Handle syntax_error

The following bug has been logged on the website:

Bug reference:      14861
Logged by:          Andrey Shvidky
Email address:      andrey_shvidky@hotmail.com
PostgreSQL version: 9.6.5
Operating system:   Windows 7 x64
Description:        

/*
Faced with such a unfairness.
I have a do block or function with error handling block.
In case when error type is 42601 (syntax_error) I can't get correct error
context.
The error context contains information about do block or function itself,
but not about last executed instruction.
In the folowing example, if I remove error handling I will happily have such
a message:

ERROR: subquery must return only one column
LINE 1: SELECT (select id, val1 from aaa)
But in case when error handling presents I have only sad:

message_text = subquery must return only one column
pg_exception_context = PL/pgSQL function inline_code_block line 9 at
assignment
pg_exception_detail =

Where information about "SELECT (select id, val1 from aaa)" hided?
Repro script:
*/

create temp table aaa (id int, val1 text);

do language plpgsql $$
declareerror_message			text;error_detailed_message	text;error_context			text;arr_test				aaa[];
begin--arr_test = (select row(id, val1) from aaa);		-- No error, correct callarr_test = (select id, val1 from aaa);			-- Error 42601 syntax_error 
exception--when syntax_error thenwhen others then	get stacked diagnostics		error_message = message_text           ,error_context = pg_exception_context		,error_detailed_message = pg_exception_detail;
	raise notice 'message_text = %', error_message;	raise notice 'pg_exception_context = %', error_context;       raise notice 'pg_exception_detail = %', error_detailed_message;
end
$$;

drop table if exists aaa;


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