Repeated use of an attribute

[finanalyst]

I'm trying to match begin and end tags for headers, eg./
<h2>...</h2>
where the level (eg.2) is in an attribute.

The following template fails:

<h<?.level><.level></?>>
<.text>
</h<?.level><.level></?>>

The problem appears to bre related to <.level> being called repeatedly.
The full error message is as follows:

An operation first awaited:
  in sub compile-dir at /home/richard/.raku/sources/8727B7CE66F46D2210CCD9CE826288AA463FF9AC (Cro::WebApp::Template) line 108
  in sub template-location at /home/richard/.raku/sources/8727B7CE66F46D2210CCD9CE826288AA463FF9AC (Cro::WebApp::Template) line 102
  in block <unit> at do-templ.raku line 5

Died with the exception:
    Template parse failed: confused at line 3 near '</?>>'
      in method panic at /home/richard/.raku/sources/8262DE42E320C5C27BF8F4B9C4B9D431C700EDBE (Cro::WebApp::Template::Parser) line 425
      in regex TOP at /home/richard/.raku/sources/8262DE42E320C5C27BF8F4B9C4B9D431C700EDBE (Cro::WebApp::Template::Parser) line 21
      in sub load-template at /home/richard/.raku/sources/5B4AC652518EF031FD5F107F81DAA12BAB60A86B (Cro::WebApp::Template::Repository) line 134
      in code  at /home/richard/.raku/sources/5B4AC652518EF031FD5F107F81DAA12BAB60A86B (Cro::WebApp::Template::Repository) line 76

[jnthn]

It was never really intended that one could interpolate tag names. It does - far more by accident than design - work out for opening tags, however I suspect that will cease to work with the most obvious implementation of #44. For closing tags we simply never try to parse inside of them and thus end up confused.

I've mixed feelings about supporting this; I really want structured tag support as requested in the referenced issue, but supporting interpolating into HTML tag names will significantly complicate it.

[finanalyst]

FWIW, I found a workaround using a sub.
For the example I was needing:

<:sub heading($level=1,:$close=False)>
<?$close>/</?>h<$level></:>

<<&heading(.level)> id="<.target>">
<a href="#<.top>" class="u" title="go to top of document">
<.text>
</a>
<<&heading(.level,:close)>>