060 quoted branch with space

// PIN (quote-decode) — a quoted branch name may contain SPACES.
//
// Branch names are bytes; backtick/bracket quoting is source ENCODING that
// lets the source express any name. The decoded (inner) content is stored —
// glyphs never enter the AST. A regex pattern with a space (`[a-z ]+@...`)
// must survive byte-for-byte through parseBranchInfo, which historically
// whitespace-tokenized the branch line and split mid-pattern.
//
// Same scan-transform trick as 010_059: bake the FIRST continuation's branch
// name into a @compileError so it surfaces verbatim. EXPECT (CONTAINS):
// `pattern=[a-z ]+@[a-z]+` — space intact, NO quoting glyphs in the stored
// name. RED until the parser decodes quotes (space currently breaks
// tokenization).
const std = @import("std");

~[comptime|transform]pub tor scan-spaced {
    invocation: *const Invocation,
    item: *const std/compiler:Item,
    program: *const std/compiler:Program,
} -> SiteResult

~proc scan-spaced|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 == 0) return .{};

    const pattern = flow.body.continuations[0].branch;

    const code = std.fmt.allocPrint(
        allocator,
        "comptime {{ @compileError(\"pattern={s}\"); }}",
        .{pattern},
    ) 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-spaced()
| `[a-z ]+@[a-z]+` _ |> _
| no-match |> _