Fix issue #17999 (Unused variables inside `for` are not detected)
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@ -1464,6 +1464,8 @@ fn check_expr(this: &mut Liveness, expr: &Expr) {
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this.pat_bindings(&**pat, |this, ln, var, sp, id| {
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this.warn_about_unused(sp, id, ln, var);
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});
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visit::walk_expr(this, expr);
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}
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// no correctness conditions related to liveness
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@ -0,0 +1,20 @@
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![deny(unused_variable)]
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fn main() {
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for _ in range(1i, 101) {
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let x = (); //~ ERROR: unused variable: `x`
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match () {
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a => {} //~ ERROR: unused variable: `a`
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}
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}
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}
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