21 lines
697 B
Rust
21 lines
697 B
Rust
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import std::ivec;
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import std::option;
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import base::*;
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import syntax::ast;
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fn expand_syntax_ext(cx: &ext_ctxt, sp: codemap::span, arg: @ast::expr,
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body: option::t[str]) -> @ast::expr {
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let args: (@ast::expr)[] = alt arg.node {
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ast::expr_vec(elts, _, _) { elts }
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_ { cx.span_fatal(sp, "#ident_to_str requires a vector argument .") }
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};
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if ivec::len[@ast::expr](args) != 1u {
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cx.span_fatal(sp, "malformed #ident_to_str call");
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}
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ret make_new_lit(cx, sp,
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ast::lit_str(expr_to_ident(cx, args.(0u),
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"expected an ident"),
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ast::sk_rc));
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}
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