CVS log for src/usr.bin/make/unit-tests/varname-dot-suffixes.exp

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Default branch: MAIN

make: simplify debug message for the ':@var@...@' modifier

The previous variant was hard to understand.

make: use consistent debug messages style when ignoring variables

When a variable is not modified or not deleted, clearly say so and state
the reason.  Use the same style of debug messages everywhere, putting
the word 'ignoring' at the front.  Previously, that word sticked out to
the right, but only in some cases.

make: fix confusing debug logging when deleting a variable

Be clear when deleting a variable is ignored and state the reason,
instead of only providing a keyword as a hint for insiders.

make: revert parsing of modifier parts (since 2022-08-08)

The modifier ':@var@body@' parses the body in parse-only mode and later
uses Var_Subst on it, in which each literal '$' must be written as '$$'.

Trying to parse the loop body using Var_Parse treated the text
'$${var:-0}' as a single '$' followed by the expression '${var:-0}',
wrongly complaining about the 'Unknown modifier "-0"'.

Found by sjg.

make: fix parsing of modifiers containing unbalanced subexpressions

make: avoid trailing whitespace in debug log for variables

Since trailing whitespace is invisible, describe the variable value in
words to make it visible.

make: add space after colon in debug logging for variables

These log messages are intended for human interpretation, so don't make
them unnecessarily hard to read.

tests/make: test and document the newly added "variable" .SUFFIXES