rustc: Improve misleading error message for E0282

ruuda · ruuda · commit 52e520e902ce · 2015-04-30T00:56:33.000+02:00
The error can also occur in cases where a type annotation will not help.
diff --git a/src/librustc/middle/traits/error_reporting.rs b/src/librustc/middle/traits/error_reporting.rs
@@ -290,7 +290,7 @@ pub fn maybe_report_ambiguity<'a, 'tcx>(infcx: &InferCtxt<'a, 'tcx>,
                     {
                         span_err!(infcx.tcx.sess, obligation.cause.span, E0282,
                                 "unable to infer enough type information about `{}`; \
-                                 type annotations required",
+                                 type annotations or generic parameter binding required",
                                 self_ty.user_string(infcx.tcx));
                     } else {
                         span_err!(infcx.tcx.sess, obligation.cause.span, E0283,

Original file line number	Diff line number	Diff line change
`@@ -290,7 +290,7 @@ pub fn maybe_report_ambiguity<'a, 'tcx>(infcx: &InferCtxt<'a, 'tcx>,`
`290`	`290`	`{`
`291`	`291`	`span_err!(infcx.tcx.sess, obligation.cause.span, E0282,`
`292`	`292`	"unable to infer enough type information about `{}`; \
`293`		`- type annotations required",`
	`293`	`+ type annotations or generic parameter binding required",`
`294`	`294`	`self_ty.user_string(infcx.tcx));`
`295`	`295`	`} else {`
`296`	`296`	`span_err!(infcx.tcx.sess, obligation.cause.span, E0283,`