More specific spans for use_debug lint

Author: Jarcho

clippy_lints/src/write.rs

@@ -456,7 +456,7 @@ impl Write {
 
             if !self.in_debug_impl && arg.format.ty == "?" {
                 // FIXME: modify rustc's fmt string parser to give us the current span
-                span_lint(cx, USE_DEBUG, str.span, "use of `Debug`-based formatting");
+                span_lint(cx, USE_DEBUG, span, "use of `Debug`-based formatting");
             }
 
             args.push(arg, span);

tests/ui/print.stderr

@@ -1,8 +1,8 @@
 error: use of `Debug`-based formatting
-  --> $DIR/print.rs:11:19
+  --> $DIR/print.rs:11:20
    |
 LL |         write!(f, "{:?}", 43.1415)
-   |                   ^^^^^^
+   |                    ^^^^
    |
    = note: `-D clippy::use-debug` implied by `-D warnings`
 
@@ -33,10 +33,10 @@ LL |     print!("Hello {:?}", "World");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: use of `Debug`-based formatting
-  --> $DIR/print.rs:28:12
+  --> $DIR/print.rs:28:19
    |
 LL |     print!("Hello {:?}", "World");
-   |            ^^^^^^^^^^^^
+   |                   ^^^^
 
 error: use of `print!`
   --> $DIR/print.rs:30:5
@@ -45,10 +45,10 @@ LL |     print!("Hello {:#?}", "#orld");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: use of `Debug`-based formatting
-  --> $DIR/print.rs:30:12
+  --> $DIR/print.rs:30:19
    |
 LL |     print!("Hello {:#?}", "#orld");
-   |            ^^^^^^^^^^^^^
+   |                   ^^^^^
 
 error: aborting due to 8 previous errors