Markdown Style Test

28 March, 2026

This is a test post to preview how different markdown features render.

Headings

Third level

Fourth level

Text formatting

This is a paragraph with bold text, italic text, and inline code. Here’s a link to GitHub and some ~~strikethrough text~~.

This is a blockquote. It can span multiple lines and is useful for highlighting important information or quoting someone.

Code blocks

@attached(peer, names: arbitrary)
public macro Modifier() = #externalMacro(
    module: "ModifierMacroMacros",
    type: "ModifierMacro"
)

public struct ModifierMacro: PeerMacro {
    public static func expansion(
        of node: AttributeSyntax,
        providingPeersOf declaration: some DeclSyntaxProtocol,
        in context: some MacroExpansionContext
    ) throws -> [DeclSyntax] {
        guard let varDecl = declaration.as(VariableDeclSyntax.self) else {
            return []
        }
        return [DeclSyntax(stringLiteral: "// generated")]
    }
}

def generate_large_macro(num_modifiers: int):
    content = "import ModifierMacro\n\nstruct Button {\n"
    for i in range(num_modifiers):
        content += f"    @Modifier private var modifier{i}: Double = 0.0\n"
    content += "}\n"
    return content

Lists

Unordered:

First item
Second item with a longer description that wraps to the next line
Third item
- Nested item
- Another nested item

Ordered:

Clone the repo
Run swift build -c release
Execute the benchmark
Check results.json

Table

Scenario	Files	Modifiers	Time
Default	1	1	0.42s
Macro	1	1	0.89s
Large Default	1	2000	3.21s
Large Macro	1	2000	4.67s
Multi-file	100	20 each	5.12s
Multi-file Macro	100	20 each	7.34s

Mermaid diagram

graph LR
    A[Source Code] --> B[SourceKit]
    B --> C[Module Interface]
    C --> D[SwiftSyntax Rewriter]
    D --> E[Interface Module]

Horizontal rule

Image

Task list

Set up blog
Customize theme
Write first real post
Cross-post to Medium

Footnote

Swift macros expand at compile time¹, which means their cost is paid on every build.

See the Swift Evolution proposal SE-0389 for details on the macro system. ↩