achuggard wrote:

Also neither {{{<includeonly>subst:</includeonly>param|default}}} nor
{{{{{{subst|}}}param|default}}} work to solve this. (result:
{{{subst:param|default}}} in wikitext.

ayg wrote:

(In reply to comment #0)

I just noticed something slightly odd about the way templates with parameters
with default values are handled by {{subst:}} - it seems that when the
template's contents are put into the page text, parameters that are not
specified but which do have a default value are not replaced.

This request is pretty much bug 2777. Substing copies the text of the target
exactly, it doesn't subst anything that's transcluded there.

(In reply to comment #1)

Also neither {{{<includeonly>subst:</includeonly>param|default}}} nor
{{{{{{subst|}}}param|default}}} work to solve this. (result:
{{{subst:param|default}}} in wikitext.

Confirmed (look at wikitext of [[User:Simetrical/6305b]]). To clarify, "subst:"
is nonfunctional for variables, period. I'm changing the summary accordingly,
and refiling as enhancement because that isn't strictly speaking a bug.

mr.heat wrote:

I found a similar bug. Maybee it's the same. For example, I created a template called "Negative" which calculates something. The source of this template is {{<includeonly>subst:</includeonly>#expr: -{{{1}}} }} for example.

Usage: {{subst:Negative|7}}
Result: -7

Usage: {{Negative|7}}
Result: {{subst:#expr: -{{{1}}} }}

This is very strange and completely useless, obviously. The expected result is {{Negative|7}}.

mr.heat wrote:

Is this a duplicate of bug #5453?