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Avoid unnecessary internings.

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Most involving `Symbol::intern` on string literals.
This commit is contained in:
Nicholas Nethercote
2019-05-22 12:42:23 +10:00
parent 6c0ff3dd97
commit 26451ef7b5
31 changed files with 84 additions and 106 deletions
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5
src/libsyntax_ext/deriving/debug.rs
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@@ -9,6 +9,7 @@ use syntax::ast::{Expr, MetaItem};
use syntax::ext::base::{Annotatable, ExtCtxt};
use syntax::ext::build::AstBuilder;
use syntax::ptr::P;
use syntax::symbol::sym;
use syntax_pos::{DUMMY_SP, Span};
pub fn expand_deriving_debug(cx: &mut ExtCtxt<'_>,
@@ -82,7 +83,7 @@ fn show_substructure(cx: &mut ExtCtxt<'_>, span: Span, substr: &Substructure<'_>
let expr = cx.expr_method_call(span,
builder_expr.clone(),
Ident::from_str("field"),
Ident::with_empty_ctxt(sym::field),
vec![field]);
// Use `let _ = expr;` to avoid triggering the
@@ -106,7 +107,7 @@ fn show_substructure(cx: &mut ExtCtxt<'_>, span: Span, substr: &Substructure<'_>
let field = cx.expr_addr_of(field.span, field);
let expr = cx.expr_method_call(span,
builder_expr.clone(),
Ident::from_str("field"),
Ident::with_empty_ctxt(sym::field),
vec![name, field]);
stmts.push(stmt_let_undescore(cx, span, expr));
}