CVS log for src/usr.bin/make/unit-tests/var-recursive.mk

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make: reduce line length in error messages

The error messages for deeply nested parse errors were hard to decipher,
due to the large amount of text.  Split these messages into individual
lines, just as in the backtrace for .include files and .for loops.  This
unified backtrace makes the output more uniform.

tests/make: add stricter checks to test for recursive variables

make: treat recursive variables non-fatally

A recursive variable is no worse than an unknown modifier, so treat them
in the same way by continuing parsing until the end of the makefile.

make: add more context to error message about recursive variables

tests/make: replace 'variable expression' with 'expression'

Each expression is based on a variable, there's no need for the
verbosity.  The wording in make's diagnostics will be changed in a
follow-up commit.

tests/make: force line-based diagnostics to be listed in the tests

This way, contradictions between the intended output and the actual
output are closer together and have a better chance of being spotted.

tests/make: sync comment in test for recursive variable

tests/make: demonstrate recursive variable in target

make(1): add test for recursion detection with short variable names

make(1): add test for recursive variable expressions