Auto merge of #143721 - tgross35:rollup-sjdfp6r, r=tgross35

Rollup of 9 pull requests

Successful merges:

 - rust-lang/rust#141996 (Fix `proc_macro::Ident`'s handling of `$crate`)
 - rust-lang/rust#142950 (mbe: Rework diagnostics for metavariable expressions)
 - rust-lang/rust#143011 (Make lint `ambiguous_glob_imports` deny-by-default and report-in-deps)
 - rust-lang/rust#143265 (Mention as_chunks in the docs for chunks)
 - rust-lang/rust#143270 (tests/codegen/enum/enum-match.rs: accept negative range attribute)
 - rust-lang/rust#143298 (`tests/ui`: A New Order [23/N])
 - rust-lang/rust#143396 (Move NaN tests to floats/mod.rs)
 - rust-lang/rust#143398 (tidy: add support for `--extra-checks=auto:` feature)
 - rust-lang/rust#143644 (Add triagebot stdarch mention ping)

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

4 files changed, 146 insertions, 25 deletions

diff --git a/compiler/rustc_expand/messages.ftl b/compiler/rustc_expand/messages.ftl
index 3fc0fa06191..89d6e62834d 100644
--- a/compiler/rustc_expand/messages.ftl
+++ b/compiler/rustc_expand/messages.ftl
@@ -133,6 +133,32 @@ expand_module_multiple_candidates =
 expand_must_repeat_once =
     this must repeat at least once
 
+expand_mve_extra_tokens =
+    unexpected trailing tokens
+    .label = for this metavariable expression
+    .range = the `{$name}` metavariable expression takes between {$min_or_exact_args} and {$max_args} arguments
+    .exact = the `{$name}` metavariable expression takes {$min_or_exact_args ->
+        [zero] no arguments
+        [one] a single argument
+        *[other] {$min_or_exact_args} arguments
+    }
+    .suggestion = try removing {$extra_count ->
+        [one] this token
+        *[other] these tokens
+    }
+
+expand_mve_missing_paren =
+    expected `(`
+    .label = for this this metavariable expression
+    .unexpected = unexpected token
+    .note = metavariable expressions use function-like parentheses syntax
+    .suggestion = try adding parentheses
+
+expand_mve_unrecognized_expr =
+    unrecognized metavariable expression
+    .label = not a valid metavariable expression
+    .note = valid metavariable expressions are {$valid_expr_list}
+
 expand_mve_unrecognized_var =
     variable `{$key}` is not recognized in meta-variable expression
 
diff --git a/compiler/rustc_expand/src/errors.rs b/compiler/rustc_expand/src/errors.rs
index fdbc65aff68..3ac5d213053 100644
--- a/compiler/rustc_expand/src/errors.rs
+++ b/compiler/rustc_expand/src/errors.rs
@@ -496,6 +496,50 @@ pub(crate) use metavar_exprs::*;
 mod metavar_exprs {
     use super::*;
 
+    #[derive(Diagnostic, Default)]
+    #[diag(expand_mve_extra_tokens)]
+    pub(crate) struct MveExtraTokens {
+        #[primary_span]
+        #[suggestion(code = "", applicability = "machine-applicable")]
+        pub span: Span,
+        #[label]
+        pub ident_span: Span,
+        pub extra_count: usize,
+
+        // The rest is only used for specific diagnostics and can be default if neither
+        // `note` is `Some`.
+        #[note(expand_exact)]
+        pub exact_args_note: Option<()>,
+        #[note(expand_range)]
+        pub range_args_note: Option<()>,
+        pub min_or_exact_args: usize,
+        pub max_args: usize,
+        pub name: String,
+    }
+
+    #[derive(Diagnostic)]
+    #[note]
+    #[diag(expand_mve_missing_paren)]
+    pub(crate) struct MveMissingParen {
+        #[primary_span]
+        #[label]
+        pub ident_span: Span,
+        #[label(expand_unexpected)]
+        pub unexpected_span: Option<Span>,
+        #[suggestion(code = "( /* ... */ )", applicability = "has-placeholders")]
+        pub insert_span: Option<Span>,
+    }
+
+    #[derive(Diagnostic)]
+    #[note]
+    #[diag(expand_mve_unrecognized_expr)]
+    pub(crate) struct MveUnrecognizedExpr {
+        #[primary_span]
+        #[label]
+        pub span: Span,
+        pub valid_expr_list: &'static str,
+    }
+
     #[derive(Diagnostic)]
     #[diag(expand_mve_unrecognized_var)]
     pub(crate) struct MveUnrecognizedVar {
diff --git a/compiler/rustc_expand/src/mbe/metavar_expr.rs b/compiler/rustc_expand/src/mbe/metavar_expr.rs
index ffd3548019a..d2b275ad20a 100644
--- a/compiler/rustc_expand/src/mbe/metavar_expr.rs
+++ b/compiler/rustc_expand/src/mbe/metavar_expr.rs
@@ -7,6 +7,8 @@ use rustc_macros::{Decodable, Encodable};
 use rustc_session::parse::ParseSess;
 use rustc_span::{Ident, Span, Symbol};
 
+use crate::errors;
+
 pub(crate) const RAW_IDENT_ERR: &str = "`${concat(..)}` currently does not support raw identifiers";
 pub(crate) const UNSUPPORTED_CONCAT_ELEM_ERR: &str = "expected identifier or string literal";
 
@@ -40,11 +42,32 @@ impl MetaVarExpr {
     ) -> PResult<'psess, MetaVarExpr> {
         let mut iter = input.iter();
         let ident = parse_ident(&mut iter, psess, outer_span)?;
-        let Some(TokenTree::Delimited(.., Delimiter::Parenthesis, args)) = iter.next() else {
-            let msg = "meta-variable expression parameter must be wrapped in parentheses";
-            return Err(psess.dcx().struct_span_err(ident.span, msg));
+        let next = iter.next();
+        let Some(TokenTree::Delimited(.., Delimiter::Parenthesis, args)) = next else {
+            // No `()`; wrong or no delimiters. Point at a problematic span or a place to
+            // add parens if it makes sense.
+            let (unexpected_span, insert_span) = match next {
+                Some(TokenTree::Delimited(..)) => (None, None),
+                Some(tt) => (Some(tt.span()), None),
+                None => (None, Some(ident.span.shrink_to_hi())),
+            };
+            let err =
+                errors::MveMissingParen { ident_span: ident.span, unexpected_span, insert_span };
+            return Err(psess.dcx().create_err(err));
         };
-        check_trailing_token(&mut iter, psess)?;
+
+        // Ensure there are no trailing tokens in the braces, e.g. `${foo() extra}`
+        if iter.peek().is_some() {
+            let span = iter_span(&iter).expect("checked is_some above");
+            let err = errors::MveExtraTokens {
+                span,
+                ident_span: ident.span,
+                extra_count: iter.count(),
+                ..Default::default()
+            };
+            return Err(psess.dcx().create_err(err));
+        }
+
         let mut iter = args.iter();
         let rslt = match ident.as_str() {
             "concat" => parse_concat(&mut iter, psess, outer_span, ident.span)?,
@@ -56,18 +79,14 @@ impl MetaVarExpr {
             "index" => MetaVarExpr::Index(parse_depth(&mut iter, psess, ident.span)?),
             "len" => MetaVarExpr::Len(parse_depth(&mut iter, psess, ident.span)?),
             _ => {
-                let err_msg = "unrecognized meta-variable expression";
-                let mut err = psess.dcx().struct_span_err(ident.span, err_msg);
-                err.span_suggestion(
-                    ident.span,
-                    "supported expressions are count, ignore, index and len",
-                    "",
-                    Applicability::MachineApplicable,
-                );
-                return Err(err);
+                let err = errors::MveUnrecognizedExpr {
+                    span: ident.span,
+                    valid_expr_list: "`count`, `ignore`, `index`, `len`, and `concat`",
+                };
+                return Err(psess.dcx().create_err(err));
             }
         };
-        check_trailing_token(&mut iter, psess)?;
+        check_trailing_tokens(&mut iter, psess, ident)?;
         Ok(rslt)
     }
 
@@ -87,20 +106,51 @@ impl MetaVarExpr {
     }
 }
 
-// Checks if there are any remaining tokens. For example, `${ignore(ident ... a b c ...)}`
-fn check_trailing_token<'psess>(
+/// Checks if there are any remaining tokens (for example, `${ignore($valid, extra)}`) and create
+/// a diag with the correct arg count if so.
+fn check_trailing_tokens<'psess>(
     iter: &mut TokenStreamIter<'_>,
     psess: &'psess ParseSess,
+    ident: Ident,
 ) -> PResult<'psess, ()> {
-    if let Some(tt) = iter.next() {
-        let mut diag = psess
-            .dcx()
-            .struct_span_err(tt.span(), format!("unexpected token: {}", pprust::tt_to_string(tt)));
-        diag.span_note(tt.span(), "meta-variable expression must not have trailing tokens");
-        Err(diag)
-    } else {
-        Ok(())
+    if iter.peek().is_none() {
+        // All tokens consumed, as expected
+        return Ok(());
     }
+
+    // `None` for max indicates the arg count must be exact, `Some` indicates a range is accepted.
+    let (min_or_exact_args, max_args) = match ident.as_str() {
+        "concat" => panic!("concat takes unlimited tokens but didn't eat them all"),
+        "ignore" => (1, None),
+        // 1 or 2 args
+        "count" => (1, Some(2)),
+        // 0 or 1 arg
+        "index" => (0, Some(1)),
+        "len" => (0, Some(1)),
+        other => unreachable!("unknown MVEs should be rejected earlier (got `{other}`)"),
+    };
+
+    let err = errors::MveExtraTokens {
+        span: iter_span(iter).expect("checked is_none above"),
+        ident_span: ident.span,
+        extra_count: iter.count(),
+
+        exact_args_note: if max_args.is_some() { None } else { Some(()) },
+        range_args_note: if max_args.is_some() { Some(()) } else { None },
+        min_or_exact_args,
+        max_args: max_args.unwrap_or_default(),
+        name: ident.to_string(),
+    };
+    Err(psess.dcx().create_err(err))
+}
+
+/// Returns a span encompassing all tokens in the iterator if there is at least one item.
+fn iter_span(iter: &TokenStreamIter<'_>) -> Option<Span> {
+    let mut iter = iter.clone(); // cloning is cheap
+    let first_sp = iter.next()?.span();
+    let last_sp = iter.last().map(TokenTree::span).unwrap_or(first_sp);
+    let span = first_sp.with_hi(last_sp.hi());
+    Some(span)
 }
 
 /// Indicates what is placed in a `concat` parameter. For example, literals
diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
index b37548b281c..15f0bad226d 100644
--- a/compiler/rustc_lint_defs/src/builtin.rs
+++ b/compiler/rustc_lint_defs/src/builtin.rs
@@ -4343,11 +4343,12 @@ declare_lint! {
     ///
     /// [future-incompatible]: ../index.md#future-incompatible-lints
     pub AMBIGUOUS_GLOB_IMPORTS,
-    Warn,
+    Deny,
     "detects certain glob imports that require reporting an ambiguity error",
     @future_incompatible = FutureIncompatibleInfo {
         reason: FutureIncompatibilityReason::FutureReleaseError,
         reference: "issue #114095 <https://github.com/rust-lang/rust/issues/114095>",
+        report_in_deps: true,
     };
 }