Fix handling of multiple block macros in the same with statement#22

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Technologicat wants to merge 2 commits intoazazel75:masterfrom

Technologicat:withfix2

Commits on Oct 27, 2018

make 'with m1, m2:' work the same as nested 'with m2: with m1:' (note ordering), even if new_tree completely replaces in_tree.body
Technologicat
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Commits on May 15, 2019

add test for multiple block macros in the same 'with', for the case where the inner macro returns a completely new tree
Technologicat
committed