tst/klammerset/wrap/dup.k

# A declaration of the symbol "kit" from a file that is NOT kit/kit.k.
# Since 2026-08-15 that is an ERROR: a klammerset that can be named is
# identified by where it is, so a symbol names one file and one file declares
# one symbol.  This fixture exists to prove the error; it formerly proved that
# such a duplicate was tolerated and skipped.
@@@klammerset kit | Duplicate declaration of kit :files dup_only.k @@@
An output policy for the three commands, and @cond as a true special form A snapshot of the development tree. The substantial changes since the last one: COMMAND OUTPUT POLICY. The three commands display text in exactly three cases, and each owns a stream: LOGGING under "-v" greater than 0 and an ERROR before termination go to STDERR; OUTPUT THE USER ASKED FOR goes to STDOUT. For ktext that output is a document, so "ktext doc.kt -d \| ..." is now safe -- logging used to share the stream and land inside the document. A bare command prints its usage and succeeds rather than failing. Colour is emitted only to a terminal, per stream, and NO_COLOR is honoured. "-v 1" reports every decision whose outcome you could not have read off your own input: the klammerset that was loaded and from which file, a font's directory, a ":files" name's file, how "-o" was expanded. Higher levels are the trace. The commands no longer warn and continue: an anomaly is an error, described with its location. Two exceptions remain, each for a stated reason -- a condition that is expected and temporary by design, and a judgment that is a heuristic rather than exact. @cond IS NOW A TRUE SPECIAL FORM, resolved at APPLICATION time rather than when the file is read. Two consequences for a writer: * a state variable reaches the predicate. "@@@state Flag :value true @@@ @cond Flag \| T \| F @" renders "T"; it used to see the literal "Flag" and silently take the false branch. The document now behaves like a klammer body, whose arguments are bound before its conditionals are decided. * nothing in a discarded branch happens -- it is not read, not evaluated, not expanded. An @eval in the branch not taken used to run anyway. Its predicate relation is total and strict: true, True, 1; false, False, 0, and empty; anything else is an error at the @cond rather than silently false. @eval REACHING OUTSIDE. ":shell" and ":haskell" now keep the command's standard error out of the document (it appears under "-v 1") and treat a nonzero exit as an error naming what the command reported. A command that exits nonzero on purpose -- "grep" finding no match -- says so with "\|\| true". KLAMMER SETS. Several combine: "--klammersets a b c" loads all three in the order given, sharing one namespace, with the definition modes deciding collisions. "none" means none and may not be combined with other symbols. A klammerset with symbol X is declared in a file X/X.k, which is what lets two sets require the same third set without loading it twice. TESTS. Four new suites: the kdiag command's interface, the @eval primitive's contract with the outside world, and verbosity at both tiers. Three suites that could not run on macOS at all now do. Assembled from dev commit 6c8ee6c22fca. 2026-08-16 01:37:59 +02:00			`# A declaration of the symbol "kit" from a file that is NOT kit/kit.k.`
			`# Since 2026-08-15 that is an ERROR: a klammerset that can be named is`
			`# identified by where it is, so a symbol names one file and one file declares`
			`# one symbol. This fixture exists to prove the error; it formerly proved that`
			`# such a duplicate was tolerated and skipped.`
			`@@@klammerset kit \| Duplicate declaration of kit :files dup_only.k @@@`