When betterC triggers errors in compilation?

[eles via Digitalmars-d-learn]

Hello,

According to this:
http://forum.dlang.org/post/lddug4$jgv$1...@digitalmars.com

"-betterC" should disable support for exception handling. So I 
expected dmd to reject the following code:

===============================================
import std.stdio;

int readDieFromFile()
{
    auto file = File("the_file_that_contains_the_value", "r");

    int die;
    file.readf(" %s", &die);

    return die;
}

int tryReadingFromFile()
{
    int die;

    try {
        die = readDieFromFile();

    } catch (std.exception.ErrnoException exc) {
        writeln("(Could not read from file; assuming 1)");
        die = 1;
    }

    return die;
}

void main()
{
    const int die = tryReadingFromFile();

    writeln("Die value: ", die);
}
=======================================================
(from Ali's book; thanks once again)

But it compiles and runs fine:

$dmd betterC.d -betterC

$./betterC
(Could not read from file; assuming 1)
Die value: 1

This is with dmd 2.066 on Linux x86_64.

What code would fail under -betterC and how?