Auto merge of #107889 - matthiaskrgr:rollup-c0d4al0, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #107789 (Avoid exposing type parameters and implementation details sourced from macro expansions)
 - #107836 (Handle properly when there is no crate attrs)
 - #107839 (avoid duplicating the RUSTC_LOG env var name)
 - #107866 (Allow wasi-libc to initialize its environment variables lazily.)
 - #107876 (create symlink only for non-windows operating systems)
 - #107882 (Cleanup typos in en_US/borrowck.ftl)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

15 files changed, 88 insertions, 43 deletions

diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index bdf2978cee2..37967bfdff5 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -624,7 +624,10 @@ fn print_crate_info(
                 println!("{}", serde_json::to_string_pretty(&sess.target.to_json()).unwrap());
             }
             FileNames | CrateName => {
-                let attrs = attrs.as_ref().unwrap();
+                let Some(attrs) = attrs.as_ref() else {
+                    // no crate attributes, print out an error and exit
+                    return Compilation::Continue;
+                };
                 let t_outputs = rustc_interface::util::build_output_filenames(attrs, sess);
                 let id = rustc_session::output::find_crate_name(sess, attrs);
                 if *req == PrintRequest::CrateName {
diff --git a/compiler/rustc_error_messages/locales/en-US/borrowck.ftl b/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
index fe77cf23e8f..a3b6b5e8138 100644
--- a/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
+++ b/compiler/rustc_error_messages/locales/en-US/borrowck.ftl
@@ -18,7 +18,7 @@ borrowck_generic_does_not_live_long_enough =
     `{$kind}` does not live long enough
 
 borrowck_move_borrowed =
-    cannot move out of `{$desc}` beacause it is borrowed
+    cannot move out of `{$desc}` because it is borrowed
 
 borrowck_var_does_not_need_mut =
     variable does not need to be mutable
@@ -87,10 +87,10 @@ borrowck_use_due_to_use_closure =
     use occurs due to use in closure
 
 borrowck_assign_due_to_use_closure =
-    assign occurs due to use in closure
+    assignment occurs due to use in closure
 
 borrowck_assign_part_due_to_use_closure =
-    assign to part occurs due to use in closure
+    assignment to part occurs due to use in closure
 
 borrowck_capture_immute =
     capture is immutable because of use here
diff --git a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
index b8c843a8a5a..c092efbb557 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
@@ -158,8 +158,12 @@ fn fmt_printer<'a, 'tcx>(infcx: &'a InferCtxt<'tcx>, ns: Namespace) -> FmtPrinte
         if infcx.probe_ty_var(ty_vid).is_ok() {
             warn!("resolved ty var in error message");
         }
-        if let TypeVariableOriginKind::TypeParameterDefinition(name, _) =
-            infcx.inner.borrow_mut().type_variables().var_origin(ty_vid).kind
+
+        let mut infcx_inner = infcx.inner.borrow_mut();
+        let ty_vars = infcx_inner.type_variables();
+        let var_origin = ty_vars.var_origin(ty_vid);
+        if let TypeVariableOriginKind::TypeParameterDefinition(name, _) = var_origin.kind
+            && !var_origin.span.from_expansion()
         {
             Some(name)
         } else {
@@ -254,7 +258,7 @@ impl<'tcx> InferCtxt<'tcx> {
                     if let TypeVariableOriginKind::TypeParameterDefinition(name, def_id) =
                         var_origin.kind
                     {
-                        if name != kw::SelfUpper {
+                        if name != kw::SelfUpper && !var_origin.span.from_expansion() {
                             return InferenceDiagnosticsData {
                                 name: name.to_string(),
                                 span: Some(var_origin.span),
@@ -780,7 +784,7 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
         // The sources are listed in order of preference here.
         let tcx = self.infcx.tcx;
         let ctx = CostCtxt { tcx };
-        let base_cost = match source.kind {
+        match source.kind {
             InferSourceKind::LetBinding { ty, .. } => ctx.ty_cost(ty),
             InferSourceKind::ClosureArg { ty, .. } => ctx.ty_cost(ty),
             InferSourceKind::GenericArg { def_id, generic_args, .. } => {
@@ -797,17 +801,17 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
             InferSourceKind::ClosureReturn { ty, should_wrap_expr, .. } => {
                 30 + ctx.ty_cost(ty) + if should_wrap_expr.is_some() { 10 } else { 0 }
             }
-        };
-
-        let suggestion_may_apply = if source.from_expansion() { 10000 } else { 0 };
-
-        base_cost + suggestion_may_apply
+        }
     }
 
     /// Uses `fn source_cost` to determine whether this inference source is preferable to
     /// previous sources. We generally prefer earlier sources.
     #[instrument(level = "debug", skip(self))]
     fn update_infer_source(&mut self, mut new_source: InferSource<'tcx>) {
+        if new_source.from_expansion() {
+            return;
+        }
+
         let cost = self.source_cost(&new_source) + self.attempt;
         debug!(?cost);
         self.attempt += 1;
@@ -819,6 +823,7 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
             // `let x: _ = iter.collect();`, as this is a very common case.
             *def_id = Some(did);
         }
+
         if cost < self.infer_source_cost {
             self.infer_source_cost = cost;
             self.infer_source = Some(new_source);
diff --git a/compiler/rustc_log/src/lib.rs b/compiler/rustc_log/src/lib.rs
index 019fdc30dce..de26fd61e4d 100644
--- a/compiler/rustc_log/src/lib.rs
+++ b/compiler/rustc_log/src/lib.rs
@@ -14,7 +14,7 @@
 //!
 //! ```
 //! fn main() {
-//!     rustc_log::init_rustc_env_logger().unwrap();
+//!     rustc_log::init_env_logger("LOG").unwrap();
 //!
 //!     let edition = rustc_span::edition::Edition::Edition2021;
 //!     rustc_span::create_session_globals_then(edition, || {
@@ -23,9 +23,9 @@
 //! }
 //! ```
 //!
-//! Now `RUSTC_LOG=debug cargo run` will run your minimal main.rs and show
+//! Now `LOG=debug cargo run` will run your minimal main.rs and show
 //! rustc's debug logging. In a workflow like this, one might also add
-//! `std::env::set_var("RUSTC_LOG", "debug")` to the top of main so that `cargo
+//! `std::env::set_var("LOG", "debug")` to the top of main so that `cargo
 //! run` by itself is sufficient to get logs.
 //!
 //! The reason rustc_log is a tiny separate crate, as opposed to exposing the
@@ -53,12 +53,6 @@ use tracing_subscriber::fmt::{
 };
 use tracing_subscriber::layer::SubscriberExt;
 
-pub fn init_rustc_env_logger() -> Result<(), Error> {
-    init_env_logger("RUSTC_LOG")
-}
-
-/// In contrast to `init_rustc_env_logger` this allows you to choose an env var
-/// other than `RUSTC_LOG`.
 pub fn init_env_logger(env: &str) -> Result<(), Error> {
     let filter = match env::var(env) {
         Ok(env) => EnvFilter::new(env),
diff --git a/library/std/src/sys/wasi/os.rs b/library/std/src/sys/wasi/os.rs
index f5513e9996d..9919dc7087e 100644
--- a/library/std/src/sys/wasi/os.rs
+++ b/library/std/src/sys/wasi/os.rs
@@ -21,6 +21,7 @@ mod libc {
     extern "C" {
         pub fn getcwd(buf: *mut c_char, size: size_t) -> *mut c_char;
         pub fn chdir(dir: *const c_char) -> c_int;
+        pub fn __wasilibc_get_environ() -> *mut *mut c_char;
     }
 }
 
@@ -161,7 +162,12 @@ impl Iterator for Env {
 pub fn env() -> Env {
     unsafe {
         let _guard = env_read_lock();
-        let mut environ = libc::environ;
+
+        // Use `__wasilibc_get_environ` instead of `environ` here so that we
+        // don't require wasi-libc to eagerly initialize the environment
+        // variables.
+        let mut environ = libc::__wasilibc_get_environ();
+
         let mut result = Vec::new();
         if !environ.is_null() {
             while !(*environ).is_null() {
diff --git a/src/bootstrap/download.rs b/src/bootstrap/download.rs
index b9db9f12cdf..6dcba117c24 100644
--- a/src/bootstrap/download.rs
+++ b/src/bootstrap/download.rs
@@ -340,9 +340,12 @@ impl Config {
         let rustfmt_path = bin_root.join("bin").join(exe("rustfmt", host));
         let rustfmt_stamp = bin_root.join(".rustfmt-stamp");
 
-        let legacy_rustfmt = self.initial_rustc.with_file_name(exe("rustfmt", host));
-        if !legacy_rustfmt.exists() {
-            t!(self.symlink_file(&rustfmt_path, &legacy_rustfmt));
+        #[cfg(not(windows))]
+        {
+            let legacy_rustfmt = self.initial_rustc.with_file_name(exe("rustfmt", host));
+            if !legacy_rustfmt.exists() {
+                t!(self.symlink_file(&rustfmt_path, &legacy_rustfmt));
+            }
         }
 
         if rustfmt_path.exists() && !program_out_of_date(&rustfmt_stamp, &channel) {
diff --git a/tests/run-make/no-input-file/Makefile b/tests/run-make/no-input-file/Makefile
new file mode 100644
index 00000000000..2f02159229d
--- /dev/null
+++ b/tests/run-make/no-input-file/Makefile
@@ -0,0 +1,4 @@
+include ../../run-make-fulldeps/tools.mk
+
+all:
+	$(RUSTC) --print crate-name 2>&1 | diff - no-input-file.stderr
diff --git a/tests/run-make/no-input-file/no-input-file.stderr b/tests/run-make/no-input-file/no-input-file.stderr
new file mode 100644
index 00000000000..b843eb524f3
--- /dev/null
+++ b/tests/run-make/no-input-file/no-input-file.stderr
@@ -0,0 +1,2 @@
+error: no input filename given
+
diff --git a/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.rs b/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.rs
new file mode 100644
index 00000000000..7f6758f47f8
--- /dev/null
+++ b/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.rs
@@ -0,0 +1,19 @@
+// ignore-tidy-linelength
+
+// Regression test for #107745.
+// Previously need_type_info::update_infer_source will consider expressions originating from
+// macro expressions as candiate "previous sources". This unfortunately can mean that
+// for macros expansions such as `format!()` internal implementation details can leak, such as:
+//
+// ```
+// error[E0282]: type annotations needed
+// --> src/main.rs:2:22
+//  |
+//2 |     println!("{:?}", []);
+//  |                      ^^ cannot infer type of the type parameter `T` declared on the associated function `new_debug`
+// ```
+
+fn main() {
+    println!("{:?}", []);
+    //~^ ERROR type annotations needed
+}
diff --git a/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.stderr b/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.stderr
new file mode 100644
index 00000000000..464655bbcf4
--- /dev/null
+++ b/tests/ui/inference/need_type_info/issue-107745-avoid-expr-from-macro-expansion.stderr
@@ -0,0 +1,11 @@
+error[E0282]: type annotations needed
+  --> $DIR/issue-107745-avoid-expr-from-macro-expansion.rs:17:22
+   |
+LL |     println!("{:?}", []);
+   |                      ^^ cannot infer type
+   |
+   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0282`.
diff --git a/tests/ui/issues/issue-16966.stderr b/tests/ui/issues/issue-16966.stderr
index 60f5190dbd0..8c92505b5eb 100644
--- a/tests/ui/issues/issue-16966.stderr
+++ b/tests/ui/issues/issue-16966.stderr
@@ -1,10 +1,8 @@
 error[E0282]: type annotations needed
-  --> $DIR/issue-16966.rs:2:5
+  --> $DIR/issue-16966.rs:2:12
    |
 LL |     panic!(std::default::Default::default());
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `M` declared on the function `begin_panic`
-   |
-   = note: this error originates in the macro `$crate::panic::panic_2015` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
 
 error: aborting due to previous error
 
diff --git a/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.rs b/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.rs
index da95c1bfa27..a56cd17773d 100644
--- a/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.rs
+++ b/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.rs
@@ -17,7 +17,7 @@ fn test2<T1, T2>(arg1 : T1, arg2 : T2) {
 fn test3<'a>(arg : &'a u32) {
   let v : Vec<'a = vec![];
     //~^ ERROR: expected one of
-    //~| ERROR: type annotations needed for `Vec<T>`
+    //~| ERROR: type annotations needed for `Vec<_>`
 }
 
 fn main() {}
diff --git a/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.stderr b/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.stderr
index bad241634cb..b2448774ae9 100644
--- a/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.stderr
+++ b/tests/ui/parser/missing-closing-angle-bracket-eq-constraint.stderr
@@ -39,26 +39,26 @@ help: you might have meant to end the type parameters here
 LL |   let v : Vec<'a> = vec![];
    |                 +
 
-error[E0282]: type annotations needed for `Vec<T>`
+error[E0282]: type annotations needed for `Vec<_>`
   --> $DIR/missing-closing-angle-bracket-eq-constraint.rs:7:7
    |
 LL |   let v : Vec<(u32,_) = vec![];
    |       ^
    |
-help: consider giving `v` an explicit type, where the type for type parameter `T` is specified
+help: consider giving `v` an explicit type, where the placeholders `_` are specified
    |
-LL |   let v: Vec<T> : Vec<(u32,_) = vec![];
+LL |   let v: Vec<_> : Vec<(u32,_) = vec![];
    |        ++++++++
 
-error[E0282]: type annotations needed for `Vec<T>`
+error[E0282]: type annotations needed for `Vec<_>`
   --> $DIR/missing-closing-angle-bracket-eq-constraint.rs:18:7
    |
 LL |   let v : Vec<'a = vec![];
    |       ^
    |
-help: consider giving `v` an explicit type, where the type for type parameter `T` is specified
+help: consider giving `v` an explicit type, where the placeholders `_` are specified
    |
-LL |   let v: Vec<T> : Vec<'a = vec![];
+LL |   let v: Vec<_> : Vec<'a = vec![];
    |        ++++++++
 
 error: aborting due to 5 previous errors
diff --git a/tests/ui/type/type-check/cannot_infer_local_or_vec.stderr b/tests/ui/type/type-check/cannot_infer_local_or_vec.stderr
index b63d2a3b61c..09c4b2053b2 100644
--- a/tests/ui/type/type-check/cannot_infer_local_or_vec.stderr
+++ b/tests/ui/type/type-check/cannot_infer_local_or_vec.stderr
@@ -1,12 +1,12 @@
-error[E0282]: type annotations needed for `Vec<T>`
+error[E0282]: type annotations needed for `Vec<_>`
   --> $DIR/cannot_infer_local_or_vec.rs:2:9
    |
 LL |     let x = vec![];
    |         ^
    |
-help: consider giving `x` an explicit type, where the type for type parameter `T` is specified
+help: consider giving `x` an explicit type, where the placeholders `_` are specified
    |
-LL |     let x: Vec<T> = vec![];
+LL |     let x: Vec<_> = vec![];
    |          ++++++++
 
 error: aborting due to previous error
diff --git a/tests/ui/type/type-check/cannot_infer_local_or_vec_in_tuples.stderr b/tests/ui/type/type-check/cannot_infer_local_or_vec_in_tuples.stderr
index e544b369515..1fa253052e6 100644
--- a/tests/ui/type/type-check/cannot_infer_local_or_vec_in_tuples.stderr
+++ b/tests/ui/type/type-check/cannot_infer_local_or_vec_in_tuples.stderr
@@ -1,12 +1,12 @@
-error[E0282]: type annotations needed for `(Vec<T>,)`
+error[E0282]: type annotations needed for `(Vec<_>,)`
   --> $DIR/cannot_infer_local_or_vec_in_tuples.rs:2:9
    |
 LL |     let (x, ) = (vec![], );
    |         ^^^^^   ---------- type must be known at this point
    |
-help: consider giving this pattern a type, where the type for type parameter `T` is specified
+help: consider giving this pattern a type, where the placeholders `_` are specified
    |
-LL |     let (x, ): (Vec<T>,) = (vec![], );
+LL |     let (x, ): (Vec<_>,) = (vec![], );
    |              +++++++++++
 
 error: aborting due to previous error