verify: use some intermediate variables instead of a multi-liner
This is shorter and easier to read as the indentation remains the same.
We extract the long message in a module level constant for clarity.
Differential Revision: https://phab.mercurial-scm.org/D10819
# See http://EditorConfig.org for the specification
root = true
[*.py]
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[*.{c,h}]
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[*.t]
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