CUTOUT001 - Invalid Template

The template could not be parsed. The diagnostic is reported on the template method and reads,

CUTOUT001: Failed to parse template for Templates.Test: <parser message>

Common causes are a block without an end, an expression inside an interpolation hole that does not compile, or a Liquid feature that Cutout does not implement, such as filters.

[Cutout.Template("""
    {% if product.Title %}
    {{ product.Title }}
    """)]
public static partial void Test(this StringBuilder builder, Product product);

The if block above is never closed, so the generator reports CUTOUT001 instead of generating code. Fix the template; see Template Syntax for the supported statements.