The note about missing implementation is absent for some operators

[dzamlo]

If you try to use an operator on a type that doesn't implement it, the error include an note similar to this one:

note: an implementation of `std::ops::Add` might be missing for `Foo`

But for three operator, this note is missing:

• ^, BitXor
• -, Neg (the unary negation)
• !, Not

This note is also missing for all the *Assign version of the operators.

I've made a minimal example with the playground:
https://play.rust-lang.org/?gist=1df2a3964559faed35efb8427d9c3608&version=nightly

[zackmdavis]

Relevant code seems to be

rust/src/librustc_typeck/check/op.rs

Lines 284 to 298 in d5616e1

	let missing_trait = match op.node {
	hir::BiAdd => Some("std::ops::Add"),
	hir::BiSub => Some("std::ops::Sub"),
	hir::BiMul => Some("std::ops::Mul"),
	hir::BiDiv => Some("std::ops::Div"),
	hir::BiRem => Some("std::ops::Rem"),
	hir::BiBitAnd => Some("std::ops::BitAnd"),
	hir::BiBitOr => Some("std::ops::BitOr"),
	hir::BiShl => Some("std::ops::Shl"),
	hir::BiShr => Some("std::ops::Shr"),
	hir::BiEq | hir::BiNe => Some("std::cmp::PartialEq"),
	hir::BiLt | hir::BiLe | hir::BiGt | hir::BiGe =>
	Some("std::cmp::PartialOrd"),
	_ => None
	};