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librustc: Parse, but do not fully turn on, the ref keyword for

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by-reference upvars.

This partially implements RFC 38. A snapshot will be needed to turn this
on, because stage0 cannot yet parse the keyword.

Part of #12381.
This commit is contained in:
Patrick Walton 2014-07-23 12:43:29 -07:00
parent 28b5e4588f
commit a63003fe1a
29 changed files with 254 additions and 72 deletions
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4
src/libsyntax/ext/build.rs
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@ -876,14 +876,14 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
fn lambda_fn_decl(&self, span: Span,
fn_decl: P<ast::FnDecl>, blk: P<ast::Block>) -> Gc<ast::Expr> {
self.expr(span, ast::ExprFnBlock(fn_decl, blk))
self.expr(span, ast::ExprFnBlock(ast::CaptureByRef, fn_decl, blk))
}
fn lambda(&self, span: Span, ids: Vec<ast::Ident> , blk: P<ast::Block>) -> Gc<ast::Expr> {
let fn_decl = self.fn_decl(
ids.iter().map(|id| self.arg(span, *id, self.ty_infer(span))).collect(),
self.ty_infer(span));
self.expr(span, ast::ExprFnBlock(fn_decl, blk))
self.expr(span, ast::ExprFnBlock(ast::CaptureByRef, fn_decl, blk))
}
fn lambda0(&self, span: Span, blk: P<ast::Block>) -> Gc<ast::Expr> {
self.lambda(span, Vec::new(), blk)