Don't put a newline before ? when it is the second sub-expression in a chain (#1012)

Fixes #1003

Author: nrc

src/chains.rs

@@ -179,7 +179,9 @@ pub fn rewrite_chain(expr: &ast::Expr,
         format!("\n{}", indent.to_string(context.config))
     };
 
-    let first_connector = if extend {
+    let first_connector = if extend || subexpr_list.len() == 0 {
+        ""
+    } else if let ast::ExprKind::Try(_) = subexpr_list[0].node {
         ""
     } else {
         &*connector

tests/source/chains.rs

@@ -124,4 +124,12 @@ fn try_shorthand() {
     let y = a.very .loooooooooooooooooooooooooooooooooooooong()  .chain()
              .inside()          .weeeeeeeeeeeeeee()? .test()  .0
         .x;
+
+                parameterized(f,
+                              substs,
+                              def_id,
+                              Ns::Value,
+                              &[],
+                              |tcx| tcx.lookup_item_type(def_id).generics)?;
+    fooooooooooooooooooooooooooo()?.bar()?.baaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaz()?;
 }

tests/target/chains.rs

@@ -151,4 +151,14 @@ fn try_shorthand() {
         .test()
         .0
         .x;
+
+    parameterized(f,
+                  substs,
+                  def_id,
+                  Ns::Value,
+                  &[],
+                  |tcx| tcx.lookup_item_type(def_id).generics)?;
+    fooooooooooooooooooooooooooo()?
+        .bar()?
+        .baaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaz()?;
 }