(defmacro do-grid [[r rows c cols] & body] ...) — positional names, a [ ]
pattern wherever an argument is a vector, and & for the tail. The reading of
the list lives in Expand, below both sides that need it: Parse turns it into
the bindings a macro body opens with, and Macro checks a call against the same
reading before expanding it, so arity and shape are refused with the call's own
location rather than with the Loc.from_macro stamp every node of an expansion
carries.
The breaking half: [args] used to bind the whole argument list and now binds
the first argument. The whole list is [& args], and every defmacro in the tree
— prelude, vendor, tests, the elisp fixtures — was migrated to it. One grammar,
not a legacy mode.
vendor/raylib/modes.flan: five macros over the five pairs the package binds
-- with-drawing, with-mode-2d, with-mode-3d, with-texture-mode,
with-scissor-mode. A second file with no declare-c in it, split out on
vector.flan's reasoning: raylib.flan is the package's statement about C and
nothing here names C, so nothing here can be made wrong by raylib changing.
Each expands to (do (begin-... args) body... (end-...)) -- the calls the
author used to type, in the order they typed them. No let, no gensym: nothing
binds a name, so there is nothing for a caller's name to collide with.
What it removes is the End* that is missing, wrong, or no longer beside its
Begin*. What it cannot remove is a body leaving through the unwind path: a
return or an invoke-restart skips the rest of the do and the End* with it.
defer is the obvious fix and is refused inside a loop body, which is where a
pair always lives -- checked, not assumed. So sand.flan's discipline stays:
keep the restart boundary outside the pair.
35 call sites converted across examples/ and sand.flan. The one left is
core-scissor-test.flan, whose Begin and End sit in two separate `when`s with
the drawing between them -- a conditional pair is a shape a bracketing macro
cannot express.
test/programs/rl-with.flan covers with-scissor-mode, which no example can,
with a frame function unreachable from main so it needs no libraylib;
rl-with-reject.flan is the arity half.
