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Nested macros can't define any new variables #26329

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reem opened this issue Jun 16, 2015 · 3 comments
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Nested macros can't define any new variables #26329

reem opened this issue Jun 16, 2015 · 3 comments
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A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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@reem
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reem commented Jun 16, 2015

Example: http://is.gd/9LFIF2

The outer macro attempts to parse the new variables as existing ones, and errors when it can't find them.
@steveklabnik steveklabnik added the A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) label Jun 23, 2015
@mitsuhiko
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I just ran into this. Very annoying issue. If it's too hard to make the identity nesting work it would be possible to just use $$ to refer to nested variables (with added repetition at each new level).

@mitsuhiko
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This seems to be a duplicate of #6994.

@alexcrichton
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Thanks for the reference @mitsuhiko!

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@mitsuhiko @steveklabnik @alexcrichton @reem