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It now works.

Also adds "machine" to the list of modules that the parser can search for
constants.

Setting the pyexec_system_exit variable to PYEXEC_FORCED_EXT allows
SystemExit exceptions to terminate the pyexec functions.

Saves the following number of bytes of code space: 176 for bare-arm, 352
for minimal, 272 for unix x86-64, 140 for stmhal, 120 for esp8266.

The failed key is available as exc.args[0], as per CPython.

Iterables don't respond to __len__, so call __len__ on the original
argument.

Accepts only value of True.

This includes making sure that utime_mphal's sleep_ms() and sleep_us()
don't sleep on negative arguments.

As long as a port implement mp_hal_sleep_ms(), mp_hal_ticks_ms(), etc.
functions, it can just use standard implementations of utime.sleel_ms(),
utime.ticks_ms(), etc. Python-level functions.

Now there is just one function to allocate a new vstr, namely vstr_new
(in addition to vstr_init etc).  The caller of this function should know
what initial size to allocate for the buffer, or at least have some policy
or config option, instead of leaving it to a default (as it was before).

And it gives problems with header dependencies for auto-qstr generation.

The qemu-arm port is used for testing of ARM Thumb architecture on a
desktop so should have many features enabled.

This refactors ujson.loads(s) to behave as ujson.load(StringIO(s)).

Increase in code size is: 366 bytes for unix x86-64, 180 bytes for
stmhal, 84 bytes for esp8266.

The boot issue text mentions a help() function and encourages
the user to run it. It is very disconcerting to find that the
function does not exist...
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

Initial support for running on a baremetal, low-heap systems (like esp8266),
using Python module interface.

"Forced exit" is treated as soft-reboot (Ctrl+D). But expected effect of
calling sys.exit() is termination of the current script, not any further
and more serious actions like mentioned soft reboot.

Setting emit_dent=0 is unnecessary because arriving in that part of the
if-logic will guarantee that emit_dent is already zero.

The block to check indent_top(lex)>0 is unreachable because a newline is
always inserted an the end of the input stream, and hence dedents are
always processed before EOF.

It was a relic from the days of developing the compiler and is no longer
needed, and it's impossible to trigger via a test.