Auto merge of #109734 - matthiaskrgr:rollup-oy4nlli, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #107387 (Use random `HashMap` keys on Hermit)
 - #109511 (Make `EvalCtxt`'s `infcx` private)
 - #109554 (Suggest ..= when someone tries to create an overflowing range)
 - #109675 (Do not consider elaborated projection predicates for objects in new solver)
 - #109693 (Remove ~const from alloc)
 - #109700 (Lint against escape sequences in Fluent files)
 - #109716 (Move `mir::Field` → `abi::FieldIdx`)
 - #109726 (rustdoc: Don't strip crate module)

Failed merges:

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

1 files changed, 12 insertions, 0 deletions

diff --git a/compiler/rustc_macros/src/diagnostics/fluent.rs b/compiler/rustc_macros/src/diagnostics/fluent.rs
index 38c0f4895db..3b2f5cfdc73 100644
--- a/compiler/rustc_macros/src/diagnostics/fluent.rs
+++ b/compiler/rustc_macros/src/diagnostics/fluent.rs
@@ -111,6 +111,18 @@ pub(crate) fn fluent_messages(input: proc_macro::TokenStream) -> proc_macro::Tok
             .emit();
         return failed(&crate_name);
     }
+    let mut bad = false;
+    for esc in ["\\n", "\\\"", "\\'"] {
+        for _ in resource_contents.matches(esc) {
+            bad = true;
+            Diagnostic::spanned(resource_span, Level::Error, format!("invalid escape `{esc}` in Fluent resource"))
+                .note("Fluent does not interpret these escape sequences (<https://projectfluent.org/fluent/guide/special.html>)")
+                .emit();
+        }
+    }
+    if bad {
+        return failed(&crate_name);
+    }
 
     let resource = match FluentResource::try_new(resource_contents) {
         Ok(resource) => resource,