061 backtick bracket equivalence

// PIN (quote-decode) — backtick and bracket quoting are EXACTLY equivalent.
//
// `something` and [something] are two source spellings of the SAME branch
// name. Both decode to the inner content; the stored names are byte-identical
// and carry no glyphs. (Today brackets stay attached AND get kebab-corrupted
// in other positions, while backticks stay attached as a sentinel — two
// different accidents.)
//
// The transform bakes BOTH continuations' branch names into one
// @compileError. EXPECT (CONTAINS): `names=<[a-z]+|[a-z]+>` — identical
// decoded content from the two spellings. RED until the parser decodes both
// quote forms to inner content.
const std = @import("std");

~[comptime|transform]pub event scan-two {
    invocation: *const Invocation,
    item: *const Item,
    program: *const Program,
} -> SiteResult

~proc scan-two|zig {
    const ast = @import("ast");
    const allocator = std.heap.page_allocator;

    const flow = if (item.* == .flow) &item.flow else return .{};
    if (flow.body.continuations.len < 2) return .{};

    const a = flow.body.continuations[0].branch;
    const b = flow.body.continuations[1].branch;

    const code = std.fmt.allocPrint(
        allocator,
        "comptime {{ @compileError(\"names=<{s}|{s}>\"); }}",
        .{ a, b },
    ) catch unreachable;

    const replacement = ast.Item{ .inline_code = ast.InlineCode{
        .code = code,
        .location = flow.location,
        .module = allocator.dupe(u8, flow.module) catch unreachable,
    } };

    return .{ .replacement = replacement };
}

~scan-two()
| `[a-z]+` _ |> _
| [[a-z]+] _ |> _
| no-match |> _