Variables defined in environment= in [program:x] section cannot be reused in %(ENV_X)s expansions in the same section

[Tanvi840]

Variables defined in environment= in [program:x] section cannot be reused in %(ENV_X)s expansions

For example the following gives an expansion error for %(ENV_A):
[program:x]
command=/usr/bin/example --loglevel=%(ENV_LOGLEVEL)s
environment=A="1",B="%(ENV_A)s"