Point to no_mangle/export_name attribute when linting

Author: Nemo157

compiler/rustc_lint/src/builtin.rs

@@ -290,34 +290,34 @@ impl EarlyLintPass for UnsafeCode {
             }
 
             ast::ItemKind::Fn(..) => {
-                if attr::contains_name(&it.attrs, sym::no_mangle) {
+                if let Some(attr) = attr::find_by_name(&it.attrs, sym::no_mangle) {
                     self.report_overriden_symbol_name(
                         cx,
-                        it.ident.span,
+                        attr.span,
                         "declaration of a `no_mangle` function",
                     );
                 }
-                if attr::contains_name(&it.attrs, sym::export_name) {
+                if let Some(attr) = attr::find_by_name(&it.attrs, sym::export_name) {
                     self.report_overriden_symbol_name(
                         cx,
-                        it.ident.span,
+                        attr.span,
                         "declaration of a function with `export_name`",
                     );
                 }
             }
 
             ast::ItemKind::Static(..) => {
-                if attr::contains_name(&it.attrs, sym::no_mangle) {
+                if let Some(attr) = attr::find_by_name(&it.attrs, sym::no_mangle) {
                     self.report_overriden_symbol_name(
                         cx,
-                        it.ident.span,
+                        attr.span,
                         "declaration of a `no_mangle` static",
                     );
                 }
-                if attr::contains_name(&it.attrs, sym::export_name) {
+                if let Some(attr) = attr::find_by_name(&it.attrs, sym::export_name) {
                     self.report_overriden_symbol_name(
                         cx,
-                        it.ident.span,
+                        attr.span,
                         "declaration of a static with `export_name`",
                     );
                 }

src/test/ui/lint/lint-unsafe-code.stderr

@@ -1,8 +1,8 @@
 error: declaration of a `no_mangle` function
-  --> $DIR/lint-unsafe-code.rs:31:17
+  --> $DIR/lint-unsafe-code.rs:31:1
    |
 LL | #[no_mangle] fn foo() {}
-   |                 ^^^
+   | ^^^^^^^^^^^^
    |
 note: the lint level is defined here
   --> $DIR/lint-unsafe-code.rs:3:9
@@ -12,26 +12,26 @@ LL | #![deny(unsafe_code)]
    = note: the linker's behavior with multiple libraries exporting duplicate symbol names is undefined and Rust cannot provide guarantees when you manually override them
 
 error: declaration of a `no_mangle` static
-  --> $DIR/lint-unsafe-code.rs:32:21
+  --> $DIR/lint-unsafe-code.rs:32:1
    |
 LL | #[no_mangle] static FOO: u32 = 5;
-   |                     ^^^
+   | ^^^^^^^^^^^^
    |
    = note: the linker's behavior with multiple libraries exporting duplicate symbol names is undefined and Rust cannot provide guarantees when you manually override them
 
 error: declaration of a function with `export_name`
-  --> $DIR/lint-unsafe-code.rs:34:27
+  --> $DIR/lint-unsafe-code.rs:34:1
    |
 LL | #[export_name = "bar"] fn bar() {}
-   |                           ^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: the linker's behavior with multiple libraries exporting duplicate symbol names is undefined and Rust cannot provide guarantees when you manually override them
 
 error: declaration of a static with `export_name`
-  --> $DIR/lint-unsafe-code.rs:35:31
+  --> $DIR/lint-unsafe-code.rs:35:1
    |
 LL | #[export_name = "BAR"] static BAR: u32 = 5;
-   |                               ^^^
+   | ^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: the linker's behavior with multiple libraries exporting duplicate symbol names is undefined and Rust cannot provide guarantees when you manually override them
 
@@ -114,10 +114,10 @@ LL |     unsafe {}
    |     ^^^^^^^^^
 
 error: declaration of a `no_mangle` function
-  --> $DIR/lint-unsafe-code.rs:21:25
+  --> $DIR/lint-unsafe-code.rs:21:9
    |
 LL |         #[no_mangle] fn foo() {}
-   |                         ^^^
+   |         ^^^^^^^^^^^^
 ...
 LL |     unsafe_in_macro!()
    |     ------------------ in this macro invocation
@@ -126,10 +126,10 @@ LL |     unsafe_in_macro!()
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: declaration of a `no_mangle` static
-  --> $DIR/lint-unsafe-code.rs:22:29
+  --> $DIR/lint-unsafe-code.rs:22:9
    |
 LL |         #[no_mangle] static FOO: u32 = 5;
-   |                             ^^^
+   |         ^^^^^^^^^^^^
 ...
 LL |     unsafe_in_macro!()
    |     ------------------ in this macro invocation
@@ -138,10 +138,10 @@ LL |     unsafe_in_macro!()
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: declaration of a function with `export_name`
-  --> $DIR/lint-unsafe-code.rs:23:35
+  --> $DIR/lint-unsafe-code.rs:23:9
    |
 LL |         #[export_name = "bar"] fn bar() {}
-   |                                   ^^^
+   |         ^^^^^^^^^^^^^^^^^^^^^^
 ...
 LL |     unsafe_in_macro!()
    |     ------------------ in this macro invocation
@@ -150,10 +150,10 @@ LL |     unsafe_in_macro!()
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: declaration of a static with `export_name`
-  --> $DIR/lint-unsafe-code.rs:25:39
+  --> $DIR/lint-unsafe-code.rs:25:9
    |
 LL |         #[export_name = "BAR"] static BAR: u32 = 5;
-   |                                       ^^^
+   |         ^^^^^^^^^^^^^^^^^^^^^^
 ...
 LL |     unsafe_in_macro!()
    |     ------------------ in this macro invocation