Auto merge of #25688 - nham:E0055_E0192, r=alexcrichton

 - Adds explanations for E0055, E0089, E0192, E0261-E0263, E0318
 - Improves explanations for E0250, E0368, E0372.
 - Converts 15 diagnostics to have error codes (E0380-E0394). Adds an explanation for E0380.
 - The E0087-E0090 messages currently look like "expected {} parameter(s) found {} parameter(s)". This changes them to either use "parameter" or "parameters", based on the number.

This is, in part, more progress towards #24407 

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index eb6420165da..539d594cb8b 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -4564,7 +4564,7 @@ impl<'a> Parser<'a> {
         if try!(self.eat(&token::DotDot) ){
             if generics.is_parameterized() {
                 self.span_err(impl_span, "default trait implementations are not \
-                                          allowed to have genercis");
+                                          allowed to have generics");
             }
 
             try!(self.expect(&token::OpenDelim(token::Brace)));