Ichthyostega 1d3cb6b23b Upgrade: fix test-failures (1) ...

- with Debian 12/13, the top-level `/bin`, `/sbin` and `/lib`
  are collapsed into `/usr`. Seemingly this has prompted changes
  to the way the shell prints some error messages. This broke
  the expectation of some test of the test-framework itself.

- SCons always had the policy to ''sanitise'' the invocation environment,
  to prevent unintended impact of environment settings to the test subject.
  Seemingly this now also leads to `$HOME` not being defined.
  Our file handling framework however expects to be able to expand "~"

- An old-style cast in the constructor lib::diff::Record(Mutator const&)
  is now translated into a static_cast (≙conversion); and since the appropriate
  conversion operator is missing on Mutator, the constructor attempts to
  create a temporary, by re-invoking the same constructor ⟹ Stackoverflow ↯

2025-04-24 23:39:58 +02:00

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