redundant_closure_call: split tests into fixable

Author: Manishearth

clippy_lints/src/misc_early.rs

@@ -1,5 +1,6 @@
 use crate::utils::{
-    constants, snippet, snippet_opt, span_help_and_lint, span_lint, span_lint_and_sugg, span_lint_and_then,
+    constants, snippet_opt, snippet_with_applicability, span_help_and_lint, span_lint, span_lint_and_sugg,
+    span_lint_and_then,
 };
 use if_chain::if_chain;
 use rustc::lint::{in_external_macro, EarlyContext, EarlyLintPass, LintArray, LintContext, LintPass};
@@ -414,13 +415,10 @@ impl EarlyLintPass for MiscEarlyLints {
                                 "Try not to call a closure in the expression where it is declared.",
                                 |db| {
                                     if decl.inputs.is_empty() {
-                                        let hint = snippet(cx, block.span, "..").into_owned();
-                                        db.span_suggestion(
-                                            expr.span,
-                                            "Try doing something like: ",
-                                            hint,
-                                            Applicability::MachineApplicable, // snippet
-                                        );
+                                        let mut app = Applicability::MachineApplicable;
+                                        let hint =
+                                            snippet_with_applicability(cx, block.span, "..", &mut app).into_owned();
+                                        db.span_suggestion(expr.span, "Try doing something like: ", hint, app);
                                     }
                                 },
                             );

tests/ui/redundant_closure_call.rs

@@ -1,8 +1,8 @@
+// non rustfixable, see redundant_closure_call_fixable.rs
+
 #![warn(clippy::redundant_closure_call)]
 
 fn main() {
-    let a = (|| 42)();
-
     let mut i = 1;
     let mut k = (|m| m + 1)(i);
 

tests/ui/redundant_closure_call.stderr

@@ -12,12 +12,6 @@ error: Closure called just once immediately after it was declared
 LL |     i = closure(3);
    |     ^^^^^^^^^^^^^^
 
-error: Try not to call a closure in the expression where it is declared.
-  --> $DIR/redundant_closure_call.rs:4:13
-   |
-LL |     let a = (|| 42)();
-   |             ^^^^^^^^^ help: Try doing something like: : `42`
-
 error: Try not to call a closure in the expression where it is declared.
   --> $DIR/redundant_closure_call.rs:7:17
    |
@@ -30,5 +24,5 @@ error: Try not to call a closure in the expression where it is declared.
 LL |     k = (|a, b| a * b)(1, 5);
    |         ^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors
 

tests/ui/redundant_closure_call_fixable.fixed

@@ -0,0 +1,8 @@
+// run-rustfix
+
+#![warn(clippy::redundant_closure_call)]
+#![allow(unused)]
+
+fn main() {    
+    let a = 42;
+}