Do not format generic consts

compiler/rustc_ast/src/ast.rs

@@ -414,6 +414,12 @@ pub struct WhereClause {
     pub span: Span,
 }
 
+impl WhereClause {
+    pub fn is_empty(&self) -> bool {
+        !self.has_where_token && self.predicates.is_empty()
+    }
+}
+
 impl Default for WhereClause {
     fn default() -> WhereClause {
         WhereClause { has_where_token: false, predicates: ThinVec::new(), span: DUMMY_SP }

src/tools/rustfmt/src/items.rs

@@ -2009,6 +2009,7 @@ pub(crate) struct StaticParts<'a> {
     safety: ast::Safety,
     vis: &'a ast::Visibility,
     ident: symbol::Ident,
+    generics: Option<&'a ast::Generics>,
     ty: &'a ast::Ty,
     mutability: ast::Mutability,
     expr_opt: Option<&'a ptr::P<ast::Expr>>,
@@ -2018,15 +2019,18 @@ pub(crate) struct StaticParts<'a> {
 
 impl<'a> StaticParts<'a> {
     pub(crate) fn from_item(item: &'a ast::Item) -> Self {
-        let (defaultness, prefix, safety, ty, mutability, expr) = match &item.kind {
-            ast::ItemKind::Static(s) => (None, "static", s.safety, &s.ty, s.mutability, &s.expr),
+        let (defaultness, prefix, safety, ty, mutability, expr, generics) = match &item.kind {
+            ast::ItemKind::Static(s) => {
+                (None, "static", s.safety, &s.ty, s.mutability, &s.expr, None)
+            }
             ast::ItemKind::Const(c) => (
                 Some(c.defaultness),
                 "const",
                 ast::Safety::Default,
                 &c.ty,
                 ast::Mutability::Not,
                 &c.expr,
+                Some(&c.generics),
             ),
             _ => unreachable!(),
         };
@@ -2035,6 +2039,7 @@ impl<'a> StaticParts<'a> {
             safety,
             vis: &item.vis,
             ident: item.ident,
+            generics,
             ty,
             mutability,
             expr_opt: expr.as_ref(),
@@ -2044,15 +2049,16 @@ impl<'a> StaticParts<'a> {
     }
 
     pub(crate) fn from_trait_item(ti: &'a ast::AssocItem) -> Self {
-        let (defaultness, ty, expr_opt) = match &ti.kind {
-            ast::AssocItemKind::Const(c) => (c.defaultness, &c.ty, &c.expr),
+        let (defaultness, ty, expr_opt, generics) = match &ti.kind {
+            ast::AssocItemKind::Const(c) => (c.defaultness, &c.ty, &c.expr, Some(&c.generics)),
             _ => unreachable!(),
         };
         StaticParts {
             prefix: "const",
             safety: ast::Safety::Default,
             vis: &ti.vis,
             ident: ti.ident,
+            generics,
             ty,
             mutability: ast::Mutability::Not,
             expr_opt: expr_opt.as_ref(),
@@ -2062,15 +2068,16 @@ impl<'a> StaticParts<'a> {
     }
 
     pub(crate) fn from_impl_item(ii: &'a ast::AssocItem) -> Self {
-        let (defaultness, ty, expr) = match &ii.kind {
-            ast::AssocItemKind::Const(c) => (c.defaultness, &c.ty, &c.expr),
+        let (defaultness, ty, expr, generics) = match &ii.kind {
+            ast::AssocItemKind::Const(c) => (c.defaultness, &c.ty, &c.expr, Some(&c.generics)),
             _ => unreachable!(),
         };
         StaticParts {
             prefix: "const",
             safety: ast::Safety::Default,
             vis: &ii.vis,
             ident: ii.ident,
+            generics,
             ty,
             mutability: ast::Mutability::Not,
             expr_opt: expr.as_ref(),
@@ -2085,6 +2092,14 @@ fn rewrite_static(
     static_parts: &StaticParts<'_>,
     offset: Indent,
 ) -> Option<String> {
+    // For now, if this static (or const) has generics, then bail.
+    if static_parts
+        .generics
+        .is_some_and(|g| !g.params.is_empty() || !g.where_clause.is_empty())
+    {
+        return None;
+    }
+
     let colon = colon_spaces(context.config);
     let mut prefix = format!(
         "{}{}{}{} {}{}{}",

src/tools/rustfmt/tests/target/const-generics.rs

@@ -0,0 +1,25 @@
+// Make sure we don't mess up the formatting of generic consts
+
+#![feature(generic_const_items)]
+
+const GENERIC<N, const M: usize>: i32 = 0;
+
+const WHERECLAUSE: i32 = 0
+where
+    i32:;
+
+trait Foo {
+    const GENERIC<N, const M: usize>: i32;
+
+    const WHERECLAUSE: i32
+    where
+        i32:;
+}
+
+impl Foo for () {
+    const GENERIC<N, const M: usize>: i32 = 0;
+
+    const WHERECLAUSE: i32 = 0
+    where
+        i32:;
+}