Error code E0688

Note: this error code is no longer emitted by the compiler.

In-band lifetimes were mixed with explicit lifetime binders.

Erroneous code example:

#![feature(in_band_lifetimes)] fn foo<'a>(x: &'a u32, y: &'b u32) {} // error! struct Foo<'a> { x: &'a u32 } impl Foo<'a> { fn bar<'b>(x: &'a u32, y: &'b u32, z: &'c u32) {} // error! } impl<'b> Foo<'a> { // error! fn baz() {} }

In-band lifetimes cannot be mixed with explicit lifetime binders. For example:

#![allow(unused)] fn main() { fn foo<'a, 'b>(x: &'a u32, y: &'b u32) {} // ok! struct Foo<'a> { x: &'a u32 } impl<'a> Foo<'a> { fn bar<'b,'c>(x: &'a u32, y: &'b u32, z: &'c u32) {} // ok! } impl<'a> Foo<'a> { // ok! fn baz() {} } }