compile_templates is non-deterministic on {% import ... as ... with context %}

[atetubou]

Following code generates non-deterministic compiled output.

from jinja2 import loaders
from jinja2.environment import Environment

env = Environment(loader=loaders.DictLoader({"foo": """
{% import "bar" as bar with context %}
{% import "baz" as baz with context %}
"""}))

env.compile_templates('archive', zip=None, ignore_errors=False)

 from __future__ import generator_stop
 from jinja2.runtime import LoopContext, Macro, Markup, Namespace, TemplateNotFound, TemplateReference, TemplateRuntimeError, Undefined, concat, escape, identity, internalcode, markup_join, missing, str_join
 name = 'foo'

 def root(context, missing=missing):
     resolve = context.resolve_or_missing
     undefined = environment.undefined
     cond_expr_undefined = Undefined
     if 0: yield None
     l_0_bar = l_0_baz = missing
     pass
     yield '\n'
-    l_0_bar = context.vars['bar'] = environment.get_template('bar', 'foo').make_module(context.get_all(), True, {'bar': l_0_bar, 'baz': l_0_baz})
+    l_0_bar = context.vars['bar'] = environment.get_template('bar', 'foo').make_module(context.get_all(), True, {'baz': l_0_baz, 'bar': l_0_bar})
     context.exported_vars.discard('bar')
     yield '\n'
-    l_0_baz = context.vars['baz'] = environment.get_template('baz', 'foo').make_module(context.get_all(), True, {'bar': l_0_bar, 'baz': l_0_baz})
+    l_0_baz = context.vars['baz'] = environment.get_template('baz', 'foo').make_module(context.get_all(), True, {'baz': l_0_baz, 'bar': l_0_bar})
     context.exported_vars.discard('baz')

 blocks = {}
 debug_info = '2=13&3=16'

Chromium uses jinja2 for code generator during build, and this breaks Reproducible builds when we are switching to python3.

Some more context is in https://crbug.com/1194274

Environment:

• Python version: Python 3.9.2
• Jinja version: 3.0.1

[atetubou]

I'll send a PR to fix this.