Use Location::caller() for file and line info

src/__private_api.rs

@@ -3,7 +3,8 @@
 use self::sealed::KVs;
 use crate::{Level, Metadata, Record};
 use std::fmt::Arguments;
-pub use std::{file, format_args, line, module_path, stringify};
+use std::panic::Location;
+pub use std::{format_args, module_path, stringify};
 
 #[cfg(not(feature = "kv"))]
 pub type Value<'a> = &'a str;
@@ -36,8 +37,7 @@ impl<'a> KVs<'a> for () {
 fn log_impl(
     args: Arguments,
     level: Level,
-    &(target, module_path, file): &(&str, &'static str, &'static str),
-    line: u32,
+    &(target, module_path, loc): &(&str, &'static str, &'static Location),
     kvs: Option<&[(&str, Value)]>,
 ) {
     #[cfg(not(feature = "kv"))]
@@ -52,8 +52,8 @@ fn log_impl(
         .level(level)
         .target(target)
         .module_path_static(Some(module_path))
-        .file_static(Some(file))
-        .line(Some(line));
+        .file_static(Some(loc.file()))
+        .line(Some(loc.line()));
 
     #[cfg(feature = "kv")]
     builder.key_values(&kvs);
@@ -64,25 +64,23 @@ fn log_impl(
 pub fn log<'a, K>(
     args: Arguments,
     level: Level,
-    target_module_path_and_file: &(&str, &'static str, &'static str),
-    line: u32,
+    target_module_path_and_loc: &(&str, &'static str, &'static Location),
     kvs: K,
 ) where
     K: KVs<'a>,
 {
-    log_impl(
-        args,
-        level,
-        target_module_path_and_file,
-        line,
-        kvs.into_kvs(),
-    )
+    log_impl(args, level, target_module_path_and_loc, kvs.into_kvs())
 }
 
 pub fn enabled(level: Level, target: &str) -> bool {
     crate::logger().enabled(&Metadata::builder().level(level).target(target).build())
 }
 
+#[track_caller]
+pub fn loc() -> &'static Location<'static> {
+    Location::caller()
+}
+
 #[cfg(feature = "kv")]
 mod kv_support {
     use crate::kv;

src/lib.rs

@@ -341,10 +341,6 @@
 #![warn(missing_docs)]
 #![deny(missing_debug_implementations, unconditional_recursion)]
 #![cfg_attr(all(not(feature = "std"), not(test)), no_std)]
-// When compiled for the rustc compiler itself we want to make sure that this is
-// an unstable crate
-#![cfg_attr(rustbuild, feature(staged_api, rustc_private))]
-#![cfg_attr(rustbuild, unstable(feature = "rustc_private", issue = "27812"))]
 
 #[cfg(any(
     all(feature = "max_level_off", feature = "max_level_error"),

src/macros.rs

@@ -36,8 +36,7 @@ macro_rules! log {
             $crate::__private_api::log::<&_>(
                 $crate::__private_api::format_args!($($arg)+),
                 lvl,
-                &($target, $crate::__private_api::module_path!(), $crate::__private_api::file!()),
-                $crate::__private_api::line!(),
+                &($target, $crate::__private_api::module_path!(), $crate::__private_api::loc()),
                 &[$(($crate::__log_key!($key), $crate::__log_value!($key $(:$capture)* = $($value)*))),+]
             );
         }
@@ -50,8 +49,7 @@ macro_rules! log {
             $crate::__private_api::log(
                 $crate::__private_api::format_args!($($arg)+),
                 lvl,
-                &($target, $crate::__private_api::module_path!(), $crate::__private_api::file!()),
-                $crate::__private_api::line!(),
+                &($target, $crate::__private_api::module_path!(), $crate::__private_api::loc()),
                 (),
             );
         }

tests/Cargo.toml

@@ -5,6 +5,9 @@ edition = "2021"
 publish = false
 build = "src/build.rs"
 
+[lints.rust]
+unexpected_cfgs = { level = "allow", check-cfg = ['cfg(lib_build)'] }
+
 [features]
 std = ["log/std"]
 kv = ["log/kv"]