[alexandria-devel] [PATCH] improvement wrt. signalling errors on improper sequences

[Tobias C. Rittweiler]

The attached patch improves error signalling when passing improper lists
to some of the sequence function where the docstring said that they'd
signal an error.

Additionally, introduce the macro DO-PROPER-LIST, and the function
PROPER-LIST-LENGTH -- which are used to remove some code duplication.

  -T.

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