Remove AST-building redundancy in libsyntax/ext #6578
Description
There are currently three ways to create ast elements, build::mk_*, build::ExtCtxtMethods, and pipes::ast_builder::ext_ctxt_ast_builder.
(I'm working on this.)
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There are currently three ways to create ast elements, build::mk_*, build::ExtCtxtMethods, and pipes::ast_builder::ext_ctxt_ast_builder.
(I'm working on this.)