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I see this warning compiling json 0.11.9 with rustc 1.21.0-nightly (003a929f9 2017-08-26):
warning: `#[must_use]` on methods is experimental (see issue #43302)
--> .cargo/registry/src/github.com-1ecc6299db9ec823/json-0.11.9/src/value/mod.rs:370:5
|
370 | / pub fn push<T>(&mut self, value: T) -> Result<()>
371 | | where T: Into<JsonValue> {
372 | | match *self {
373 | | JsonValue::Array(ref mut vec) => {
... |
378 | | }
379 | | }
| |_____^
|
= help: add #![feature(fn_must_use)] to the crate attributes to enable
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