From 02882fbd7edcb8d0d152afcdc8571216efcbd664 Mon Sep 17 00:00:00 2001 From: Alex Crichton Date: Fri, 28 Feb 2014 01:23:06 -0800 Subject: std: Change assert_eq!() to use {} instead of {:?} Formatting via reflection has been a little questionable for some time now, and it's a little unfortunate that one of the standard macros will silently use reflection when you weren't expecting it. This adds small bits of code bloat to libraries, as well as not always being necessary. In light of this information, this commit switches assert_eq!() to using {} in the error message instead of {:?}. In updating existing code, there were a few error cases that I encountered: * It's impossible to define Show for [T, ..N]. I think DST will alleviate this because we can define Show for [T]. * A few types here and there just needed a #[deriving(Show)] * Type parameters needed a Show bound, I often moved this to `assert!(a == b)` * `Path` doesn't implement `Show`, so assert_eq!() cannot be used on two paths. I don't think this is much of a regression though because {:?} on paths looks awful (it's a byte array). Concretely speaking, this shaved 10K off a 656K binary. Not a lot, but sometime significant for smaller binaries. --- src/libstd/comm/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/libstd/comm') diff --git a/src/libstd/comm/mod.rs b/src/libstd/comm/mod.rs index 145bee50a20..7345193a751 100644 --- a/src/libstd/comm/mod.rs +++ b/src/libstd/comm/mod.rs @@ -313,7 +313,7 @@ pub struct Chan { /// This enumeration is the list of the possible reasons that try_recv could not /// return data when called. -#[deriving(Eq, Clone)] +#[deriving(Eq, Clone, Show)] pub enum TryRecvResult { /// This channel is currently empty, but the sender(s) have not yet /// disconnected, so data may yet become available. -- cgit 1.4.1-3-g733a5