Add missing keywords to rust. (#1634)

Adds `dyn`, `Self`, and `union` to the list of rust keywords.

components/prism-rust.js

@@ -34,7 +34,7 @@ Prism.languages.rust = {
 		pattern: /'[^\s>']+/,
 		alias: 'symbol'
 	},
-	'keyword': /\b(?:abstract|alignof|as|be|box|break|const|continue|crate|do|else|enum|extern|false|final|fn|for|if|impl|in|let|loop|match|mod|move|mut|offsetof|once|override|priv|pub|pure|ref|return|sizeof|static|self|struct|super|true|trait|type|typeof|unsafe|unsized|use|virtual|where|while|yield)\b/,
+	'keyword': /\b(?:abstract|alignof|as|be|box|break|const|continue|crate|do|dyn|else|enum|extern|false|final|fn|for|if|impl|in|let|loop|match|mod|move|mut|offsetof|once|override|priv|pub|pure|ref|return|sizeof|static|self|Self|struct|super|true|trait|type|typeof|union|unsafe|unsized|use|virtual|where|while|yield)\b/,
 
 	'attribute': {
 		pattern: /#!?\[.+?\]/,

tests/languages/rust/keyword_feature.test

@@ -1,16 +1,16 @@
 abstract alignof as
 be box break const
-continue crate do
+continue crate do dyn
 else enum extern
 false final fn for
 if impl in let loop
 match mod move mut
 offsetof once override
 priv pub pure ref
 return sizeof static
-self struct super
+self Self struct super
 true trait type typeof
-unsafe unsized use
+union unsafe unsized use
 virtual where while
 yield
 
@@ -19,17 +19,17 @@ yield
 [
 	["keyword", "abstract"], ["keyword", "alignof"], ["keyword", "as"],
 	["keyword", "be"], ["keyword", "box"], ["keyword", "break"], ["keyword", "const"],
-	["keyword", "continue"], ["keyword", "crate"], ["keyword", "do"],
+	["keyword", "continue"], ["keyword", "crate"], ["keyword", "do"], ["keyword", "dyn"],
 	["keyword", "else"], ["keyword", "enum"], ["keyword", "extern"],
 	["keyword", "false"], ["keyword", "final"], ["keyword", "fn"], ["keyword", "for"],
 	["keyword", "if"], ["keyword", "impl"], ["keyword", "in"], ["keyword", "let"], ["keyword", "loop"],
 	["keyword", "match"], ["keyword", "mod"], ["keyword", "move"], ["keyword", "mut"],
 	["keyword", "offsetof"], ["keyword", "once"], ["keyword", "override"],
 	["keyword", "priv"], ["keyword", "pub"], ["keyword", "pure"], ["keyword", "ref"],
 	["keyword", "return"], ["keyword", "sizeof"], ["keyword", "static"],
-	["keyword", "self"], ["keyword", "struct"], ["keyword", "super"],
+	["keyword", "self"], ["keyword", "Self"], ["keyword", "struct"], ["keyword", "super"],
 	["keyword", "true"], ["keyword", "trait"], ["keyword", "type"], ["keyword", "typeof"],
-	["keyword", "unsafe"], ["keyword", "unsized"], ["keyword", "use"],
+	["keyword", "union"], ["keyword", "unsafe"], ["keyword", "unsized"], ["keyword", "use"],
 	["keyword", "virtual"], ["keyword", "where"], ["keyword", "while"],
 	["keyword", "yield"]
 ]