diff --git a/src/collapsible_if.rs b/src/collapsible_if.rs
index dd89b22a4..4b3c4174d 100644
--- a/src/collapsible_if.rs
+++ b/src/collapsible_if.rs
@@ -54,43 +54,38 @@ impl LateLintPass for CollapsibleIf {
 
 fn check_if(cx: &LateContext, e: &Expr) {
     if let ExprIf(ref check, ref then, ref else_) = e.node {
-        match *else_ {
-            Some(ref else_) => {
-                if_let_chain! {[
-                    let ExprBlock(ref block) = else_.node,
-                    block.stmts.is_empty(),
-                    block.rules == BlockCheckMode::DefaultBlock,
-                    let Some(ref else_) = block.expr,
-                    let ExprIf(_, _, _) = else_.node
-                ], {
-                    span_lint_and_then(cx,
-                                       COLLAPSIBLE_IF,
-                                       block.span,
-                                       "this `else { if .. }` block can be collapsed", |db| {
-                        db.span_suggestion(block.span, "try",
-                                           format!("else {}",
-                                                   snippet_block(cx, else_.span, "..")));
-                    });
-                }}
-            }
-            None => {
-                if let Some(&Expr{ node: ExprIf(ref check_inner, ref content, None), span: sp, ..}) =
+        if let Some(ref else_) = *else_ {
+            if_let_chain! {[
+                let ExprBlock(ref block) = else_.node,
+                block.stmts.is_empty(),
+                block.rules == BlockCheckMode::DefaultBlock,
+                let Some(ref else_) = block.expr,
+                let ExprIf(_, _, _) = else_.node
+            ], {
+                span_lint_and_then(cx,
+                                   COLLAPSIBLE_IF,
+                                   block.span,
+                                   "this `else { if .. }` block can be collapsed", |db| {
+                    db.span_suggestion(block.span, "try",
+                                       format!("else {}",
+                                               snippet_block(cx, else_.span, "..")));
+                });
+            }}
+        } else if let Some(&Expr{ node: ExprIf(ref check_inner, ref content, None), span: sp, ..}) =
                        single_stmt_of_block(then) {
-                    if e.span.expn_id != sp.expn_id {
-                        return;
-                    }
-                    span_lint_and_then(cx,
-                                       COLLAPSIBLE_IF,
-                                       e.span,
-                                       "this if statement can be collapsed", |db| {
-                        db.span_suggestion(e.span, "try",
-                                           format!("if {} && {} {}",
-                                                   check_to_string(cx, check),
-                                                   check_to_string(cx, check_inner),
-                                                   snippet_block(cx, content.span, "..")));
-                    });
-                }
+            if e.span.expn_id != sp.expn_id {
+                return;
             }
+            span_lint_and_then(cx,
+                               COLLAPSIBLE_IF,
+                               e.span,
+                               "this if statement can be collapsed", |db| {
+                db.span_suggestion(e.span, "try",
+                                   format!("if {} && {} {}",
+                                           check_to_string(cx, check),
+                                           check_to_string(cx, check_inner),
+                                           snippet_block(cx, content.span, "..")));
+            });
         }
     }
 }
diff --git a/src/mut_reference.rs b/src/mut_reference.rs
index d92e449e7..15e8d310c 100644
--- a/src/mut_reference.rs
+++ b/src/mut_reference.rs
@@ -33,27 +33,19 @@ impl LateLintPass for UnnecessaryMutPassed {
         let borrowed_table = cx.tcx.tables.borrow();
         match e.node {
             ExprCall(ref fn_expr, ref arguments) => {
-                match borrowed_table.node_types.get(&fn_expr.id) {
-                    Some(function_type) => {
-                        if let ExprPath(_, ref path) = fn_expr.node {
-                            check_arguments(cx, &arguments, function_type, &format!("{}", path));
-                        }
-                    }
-                    None => unreachable!(), // A function with unknown type is called.
-                    // If this happened the compiler would have aborted the
-                    // compilation long ago.
-                };
-
-
+                let function_type = borrowed_table.node_types
+                                                  .get(&fn_expr.id)
+                                                  .expect("A function with an unknown type is called. \
+                                                           If this happened, the compiler would have \
+                                                           aborted the compilation long ago");
+                if let ExprPath(_, ref path) = fn_expr.node {
+                    check_arguments(cx, &arguments, function_type, &format!("{}", path));
+                }
             }
             ExprMethodCall(ref name, _, ref arguments) => {
                 let method_call = MethodCall::expr(e.id);
-                match borrowed_table.method_map.get(&method_call) {
-                    Some(method_type) => {
-                        check_arguments(cx, &arguments, method_type.ty, &format!("{}", name.node.as_str()))
-                    }
-                    None => unreachable!(), // Just like above, this should never happen.
-                };
+                let method_type = borrowed_table.method_map.get(&method_call).expect("This should never happen.");
+                check_arguments(cx, &arguments, method_type.ty, &format!("{}", name.node.as_str()))
             }
             _ => {}
         }
diff --git a/src/utils.rs b/src/utils.rs
index b53559194..ff0c59ab2 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -657,20 +657,10 @@ pub fn is_expn_of(cx: &LateContext, mut span: Span, name: &str) -> Option<Span>
                 (ei.callee.name(), ei.call_site)
             })
         });
-
-        return match span_name_span {
-            Some((mac_name, new_span)) => {
-                if mac_name.as_str() == name {
-                    Some(new_span)
-                }
-                else {
-                    span = new_span;
-                    continue;
-                }
-            }
-            None => {
-                None
-            }
-        };
+        match span_name_span {
+            Some((mac_name, new_span)) if mac_name.as_str() == name => return Some(new_span),
+            None => return None,
+            Some((_, new_span)) => span = new_span,
+        }
     }
 }