X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_hir_typeck%2Fsrc%2Flib.rs;h=5104b448023236628cbd331d9ef885033017b8b9;hb=a673364c543986789cfbb844c925063519fb872a;hp=6fd609aeaa060f781220c9f96d63326b7d09bdd7;hpb=5caac92dc05d72fef3122c4e21bd3b70c75fcbcb;p=rust.git

diff --git a/compiler/rustc_hir_typeck/src/lib.rs b/compiler/rustc_hir_typeck/src/lib.rs
index 6fd609aeaa0..5104b448023 100644
--- a/compiler/rustc_hir_typeck/src/lib.rs
+++ b/compiler/rustc_hir_typeck/src/lib.rs
@@ -53,9 +53,9 @@
 use crate::coercion::DynamicCoerceMany;
 use crate::gather_locals::GatherLocalsVisitor;
 use rustc_data_structures::unord::UnordSet;
-use rustc_errors::{struct_span_err, MultiSpan};
+use rustc_errors::{struct_span_err, DiagnosticId, ErrorGuaranteed, MultiSpan};
 use rustc_hir as hir;
-use rustc_hir::def::Res;
+use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::Visitor;
 use rustc_hir::{HirIdMap, Node};
 use rustc_hir_analysis::astconv::AstConv;
@@ -344,7 +344,7 @@ fn typeck_with_fallback<'tcx>(
 
         fcx.select_all_obligations_or_error();
 
-        if !fcx.infcx.is_tainted_by_errors() {
+        if let None = fcx.infcx.tainted_by_errors() {
             fcx.check_transmutes();
         }
 
@@ -428,16 +428,33 @@ fn opt_find_breakable(&mut self, target_id: hir::HirId) -> Option<&mut Breakable
     }
 }
 
-fn report_unexpected_variant_res(tcx: TyCtxt<'_>, res: Res, qpath: &hir::QPath<'_>, span: Span) {
-    struct_span_err!(
-        tcx.sess,
+fn report_unexpected_variant_res(
+    tcx: TyCtxt<'_>,
+    res: Res,
+    qpath: &hir::QPath<'_>,
+    span: Span,
+    err_code: &str,
+    expected: &str,
+) -> ErrorGuaranteed {
+    let res_descr = match res {
+        Res::Def(DefKind::Variant, _) => "struct variant",
+        _ => res.descr(),
+    };
+    let path_str = rustc_hir_pretty::qpath_to_string(qpath);
+    let mut err = tcx.sess.struct_span_err_with_code(
         span,
-        E0533,
-        "expected unit struct, unit variant or constant, found {} `{}`",
-        res.descr(),
-        rustc_hir_pretty::qpath_to_string(qpath),
-    )
-    .emit();
+        format!("expected {expected}, found {res_descr} `{path_str}`"),
+        DiagnosticId::Error(err_code.into()),
+    );
+    match res {
+        Res::Def(DefKind::Fn | DefKind::AssocFn, _) if err_code == "E0164" => {
+            let patterns_url = "https://doc.rust-lang.org/book/ch18-00-patterns.html";
+            err.span_label(span, "`fn` calls are not allowed in patterns");
+            err.help(format!("for more information, visit {patterns_url}"))
+        }
+        _ => err.span_label(span, format!("not a {expected}")),
+    }
+    .emit()
 }
 
 /// Controls whether the arguments are tupled. This is used for the call