A method or constructor whose BodyFactory writes only comments or #pragma lines gets no body, so the output fails with CS1002 #157

What happens

WriteBody (TemplateRendering.cs#L286-L306) picks the shape of a member body by counting non-blank lines. A line counts even when it holds no code, such as a // comment or a #pragma directive:

• One such line is treated as an expression body and written on the declaration line after a space.
• Two or more are spliced below the declaration with no braces around them.

In both cases the member has no body. #119 and #133 fixed this for bodies made of blank lines only. Bodies made of comments or directives only were not covered.

Repro

using var cb = CodeBlocker.Create();
cb.AddClass(new ClassTemplate { Name = "C", Members = {
    new MethodTemplate { Name = "M", Type = "void", BodyFactory = b => b.WriteLine("// nothing to reset") } } });

Output:

class C
{
	void M() // nothing to reset
}

Parsing that with Roslyn gives (3,10): error CS1002: ; expected. These inputs fail the same way:

Why it matters

Generators often write a placeholder comment in place of a loop over a collection that turned out to be empty, such as // no fields to reset. Today that produces a file that does not compile. Nothing reports the problem when the code is generated; it only shows up later as a build error in the consumer's project.

Suggested fix

When choosing the body's shape, count only lines that contain code:

• Ignore lines whose code part is empty. FindCodeEnds already works out where a line comment starts, and WriteExpressionBody uses it for the same purpose.
• Ignore lines whose trimmed text starts with #.

If no line has code, write a braced block around whatever was written ({, the comment or directive lines, }) rather than " " + line.

Acceptance criteria

• The four inputs above render output that Roslyn parses with no errors, and the comments and directives are kept inside the body.
• A one-line body that contains code, such as => x; or { }, still stays on the declaration line.