Some PSQL constructions may lead to exceptions report wrong line/column
-----------------------------------------------------------------------

                 Key: CORE-6403
                 URL: http://tracker.firebirdsql.org/browse/CORE-6403
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 3.0.6, 4.0 Beta 2
            Reporter: Adriano dos Santos Fernandes


Example 1:

execute block
as
    declare n integer = 0;
begin
    while (1 / n > 0)
    do
    begin
        n = n - 1;
    end
end!

arithmetic exception, numeric overflow, or string truncation
-Integer divide by zero.  The code attempted to divide an integer value by an 
integer divisor of zero.
-At block line: 5, col: 5

If initial value of N variable is changed to 1, then error is:

-At block line: 8, col: 9

-----------

Example 2:

execute block
as
    declare n integer = 0;
    declare x integer;
begin
    for select 1 / :n from rdb$database union all select 1 / :n from 
rdb$database into x
    do
    begin
        n = n - 1;
    end
end!

arithmetic exception, numeric overflow, or string truncation
-Integer divide by zero.  The code attempted to divide an integer value by an 
integer divisor of zero.
-At block line: 6, col: 5

If initial value of N variable is changed to 1, then error is:

-At block line: 9, col: 9

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