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evade unused_variables lint in for-loop desugaring

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This commit is contained in:
Alex Burka 2015-12-14 13:36:45 -05:00
parent 4c0c4e5546
commit e0a526015d
1 changed files with 3 additions and 2 deletions
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5
src/librustc_front/lowering.rs
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@ -1499,8 +1499,9 @@ pub fn lower_expr(lctx: &LoweringContext, e: &Expr) -> P<hir::Expr> {
hir::MatchSource::ForLoopDesugar,
None);
// `{ let result = ...; result }`
let result_ident = lctx.str_to_ident("result");
// `{ let _result = ...; _result }`
// underscore prevents an unused_variables lint if the head diverges
let result_ident = lctx.str_to_ident("_result");
let let_stmt = stmt_let(lctx, e.span, false, result_ident, match_expr, None);
let result = expr_ident(lctx, e.span, result_ident, None);
let block = block_all(lctx, e.span, vec![let_stmt], Some(result));