CVS log for src/usr.bin/make/unit-tests/directive-for-errors.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: clean up tests

Prefer "expect+X" directives to be above the code generating them,
instead of "expect-X" directives below the code.

In varmod-edge.mk, separate the tests, as the common loop does not pull
its weight.

make: in error messages for anonymous variables, log the value

tests/make: test invalid character in a late .for variable name

This covers the cleanup code that frees the earlier variable names when
a late variable name is invalid.

make: provide more context information for parse/evaluate errors

make: clean up comments

No binary change, except for line numbers in assertions.

tests/make: in 'expect' lines, require the complete text of the line

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.

make: skip syntactically wrong .for loops

When a .for loop cannot be interpreted correctly, for example when there
are no iteration variables or the number of words doesn't match the
iteration variables, skip the body of the .for loop instead of
interpreting it once.

make: disallow characters like '$' in variable names in .for loops

Fixes PR 53146.

make: remove filler word 'Do' from function names for parsing

No functional change, except for debug logging.

make: rename ambiguous functions

These two functions have counterparts that include the word 'Do' in
their name, which is confusing.

No functional change.

make(1): add test for error handling and expansion in .for loops