Merge pull request #941 from marcusklaas/type-ascription

Format type ascription

Author: nrc

src/expr.rs

@@ -177,6 +177,9 @@ impl Rewrite for ast::Expr {
             ast::ExprKind::Cast(ref expr, ref ty) => {
                 rewrite_pair(&**expr, &**ty, "", " as ", "", context, width, offset)
             }
+            ast::ExprKind::Type(ref expr, ref ty) => {
+                rewrite_pair(&**expr, &**ty, "", ": ", "", context, width, offset)
+            }
             ast::ExprKind::Index(ref expr, ref index) => {
                 rewrite_pair(&**expr, &**index, "", "[", "]", context, width, offset)
             }
@@ -210,8 +213,6 @@ impl Rewrite for ast::Expr {
             // satisfy our width restrictions.
             ast::ExprKind::InPlace(..) |
             ast::ExprKind::InlineAsm(..) |
-            // TODO(#848): Handle type ascription
-            ast::ExprKind::Type(_, _) |
             // TODO(#867): Handle try shorthand
             ast::ExprKind::Try(_) => {
                 wrap_str(context.snippet(self.span),

tests/source/type-ascription.rs

@@ -0,0 +1,9 @@
+fn main() {
+    let xxxxxxxxxxx = yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy  :  SomeTrait<AA, BB, CC>;
+
+    let xxxxxxxxxxxxxxx = yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA;
+
+    let z = funk(yyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzz, wwwwww): AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA;
+
+     x : u32 - 1u32 / 10f32 : u32 
+}

tests/target/type-ascription.rs

@@ -0,0 +1,14 @@
+fn main() {
+    let xxxxxxxxxxx = yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy: SomeTrait<AA,
+                                                                                              BB,
+                                                                                              CC>;
+
+    let xxxxxxxxxxxxxxx =
+        yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA;
+
+    let z = funk(yyyyyyyyyyyyyyy,
+                 zzzzzzzzzzzzzzzz,
+                 wwwwww): AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA;
+
+    x: u32 - 1u32 / 10f32: u32
+}