Syntax highlighting not applied with regex-rules using another regex-rule

[ssrmm]

The following grammar does not produce any syntax highlighting for the keywords FLOAT and INTEGER even though it should.

namespace Test
{
  syntax module Test
  {
    using Nitra.Core;

    [StartRule]
    syntax Expressions = (Keyword sm IdentifierBody ';' nl)+;

    regex Keyword = Keyword_FLOAT | Keyword_INTEGER;

    [SpanClass(Keyword)] regex Keyword_FLOAT = "FLOAT";
    [SpanClass(Keyword)] regex Keyword_INTEGER = "INTEGER";
  }
}

As a workaround one must add [SpanClass(Keyword)] directly to regex Keyword which might not always be desirable.

[rampelstinskin]

regex don't have any information about it internals.
Use token or syntax keyword for "Keyword" rule.

[ssrmm]

Makes sense, now that you say it...