Check also for std::ptr::{null, null_mut}.

Author: boxdot

clippy_lints/src/ptr.rs

@@ -384,7 +384,10 @@ fn is_null_path(expr: &Expr<'_>) -> bool {
     if let ExprKind::Call(ref pathexp, ref args) = expr.kind {
         if args.is_empty() {
             if let ExprKind::Path(ref path) = pathexp.kind {
-                return match_qpath(path, &paths::PTR_NULL) || match_qpath(path, &paths::PTR_NULL_MUT);
+                return match_qpath(path, &paths::PTR_NULL)
+                    || match_qpath(path, &paths::PTR_NULL_MUT)
+                    || match_qpath(path, &paths::STD_PTR_NULL)
+                    || match_qpath(path, &paths::STD_PTR_NULL_MUT);
             }
         }
     }

clippy_utils/src/paths.rs

@@ -136,6 +136,7 @@ pub const STD_CONVERT_IDENTITY: [&str; 3] = ["std", "convert", "identity"];
 pub const STD_FS_CREATE_DIR: [&str; 3] = ["std", "fs", "create_dir"];
 pub const STD_MEM_TRANSMUTE: [&str; 3] = ["std", "mem", "transmute"];
 pub const STD_PTR_NULL: [&str; 3] = ["std", "ptr", "null"];
+pub const STD_PTR_NULL_MUT: [&str; 3] = ["std", "ptr", "null_mut"];
 pub const STRING_AS_MUT_STR: [&str; 4] = ["alloc", "string", "String", "as_mut_str"];
 pub const STRING_AS_STR: [&str; 4] = ["alloc", "string", "String", "as_str"];
 pub const STR_ENDS_WITH: [&str; 4] = ["core", "str", "<impl str>", "ends_with"];