Run clippy --fix for unnecessary_map_or lint

Author: yotamofek

compiler/rustc_ast_lowering/src/delegation.rs

@@ -72,7 +72,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         if let Some(local_sig_id) = def_id.as_local() {
             // The value may be missing due to recursive delegation.
             // Error will be emitted later during HIR ty lowering.
-            self.resolver.delegation_fn_sigs.get(&local_sig_id).map_or(false, |sig| sig.has_self)
+            self.resolver.delegation_fn_sigs.get(&local_sig_id).is_some_and(|sig| sig.has_self)
         } else {
             match self.tcx.def_kind(def_id) {
                 DefKind::Fn => false,

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -83,7 +83,7 @@ impl<'a> PostExpansionVisitor<'a> {
                 feature_err_issue(&self.sess, feature, span, GateIssue::Language, explain).emit();
             }
             Err(abi::AbiDisabled::Unrecognized) => {
-                if self.sess.opts.pretty.map_or(true, |ppm| ppm.needs_hir()) {
+                if self.sess.opts.pretty.is_none_or(|ppm| ppm.needs_hir()) {
                     self.sess.dcx().span_delayed_bug(
                         span,
                         format!(

compiler/rustc_attr_parsing/src/attributes/repr.rs

@@ -166,7 +166,7 @@ pub fn parse_repr_attr(sess: &Session, attr: &impl AttributeExt) -> Vec<ReprAttr
                 // the `check_mod_attrs` pass, but this pass doesn't always run
                 // (e.g. if we only pretty-print the source), so we have to gate
                 // the `span_delayed_bug` call as follows:
-                if sess.opts.pretty.map_or(true, |pp| pp.needs_analysis()) {
+                if sess.opts.pretty.is_none_or(|pp| pp.needs_analysis()) {
                     dcx.span_delayed_bug(item.span(), "unrecognized representation hint");
                 }
             }

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -2480,7 +2480,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                     // To support cases like `|| { v.call(|this| v.get()) }`
                     // FIXME: actually support such cases (need to figure out how to move from the
                     // capture place to original local).
-                    && self.res.as_ref().map_or(true, |(prev_res, _)| prev_res.span.contains(ex.span))
+                    && self.res.as_ref().is_none_or(|(prev_res, _)| prev_res.span.contains(ex.span))
                 {
                     self.res = Some((ex, closure));
                 }

compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs

@@ -131,10 +131,10 @@ impl<'tcx> BorrowExplanation<'tcx> {
                     && let Ok(pat) = tcx.sess.source_map().span_to_snippet(pat.span)
                 {
                     suggest_rewrite_if_let(tcx, expr, &pat, init, conseq, alt, err);
-                } else if path_span.map_or(true, |path_span| path_span == var_or_use_span) {
+                } else if path_span.is_none_or(|path_span| path_span == var_or_use_span) {
                     // We can use `var_or_use_span` if either `path_span` is not present, or both
                     // spans are the same.
-                    if borrow_span.map_or(true, |sp| !sp.overlaps(var_or_use_span)) {
+                    if borrow_span.is_none_or(|sp| !sp.overlaps(var_or_use_span)) {
                         err.span_label(
                             var_or_use_span,
                             format!("{borrow_desc}borrow later {message}"),

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -442,7 +442,7 @@ pub(crate) fn type_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) ->
         // (or if there is no allocator argument).
         ty::Adt(def, args)
             if def.is_box()
-                && args.get(1).map_or(true, |arg| cx.layout_of(arg.expect_ty()).is_1zst()) =>
+                && args.get(1).is_none_or(|arg| cx.layout_of(arg.expect_ty()).is_1zst()) =>
         {
             build_pointer_or_reference_di_node(cx, t, t.expect_boxed_ty(), unique_type_id)
         }

compiler/rustc_errors/src/emitter.rs

@@ -3146,7 +3146,7 @@ impl FileWithAnnotatedLines {
                     add_annotation_to_file(&mut output, Lrc::clone(&file), line, ann.as_line());
                 }
                 let line_end = ann.line_end - 1;
-                let end_is_empty = file.get_line(line_end - 1).map_or(false, |s| !filter(&s));
+                let end_is_empty = file.get_line(line_end - 1).is_some_and(|s| !filter(&s));
                 if middle < line_end && !end_is_empty {
                     add_annotation_to_file(&mut output, Lrc::clone(&file), line_end, ann.as_line());
                 }

compiler/rustc_errors/src/json.rs

@@ -463,7 +463,7 @@ impl DiagnosticSpan {
         // is an empty string, increase the length to include the newline so we don't
         // leave an empty line
         if start.col.0 == 0
-            && suggestion.map_or(false, |(s, _)| s.is_empty())
+            && suggestion.is_some_and(|(s, _)| s.is_empty())
             && let Ok(after) = je.sm.span_to_next_source(span)
             && after.starts_with('\n')
         {

compiler/rustc_errors/src/lib.rs

@@ -1717,7 +1717,7 @@ impl DiagCtxtInner {
         let bugs: Vec<_> =
             std::mem::take(&mut self.delayed_bugs).into_iter().map(|(b, _)| b).collect();
 
-        let backtrace = std::env::var_os("RUST_BACKTRACE").map_or(true, |x| &x != "0");
+        let backtrace = std::env::var_os("RUST_BACKTRACE").is_none_or(|x| &x != "0");
         let decorate = backtrace || self.ice_file.is_none();
         let mut out = self
             .ice_file

compiler/rustc_expand/src/config.rs

@@ -391,7 +391,7 @@ impl<'a> StripUnconfigured<'a> {
         validate_attr::deny_builtin_meta_unsafety(&self.sess.psess, &meta_item);
 
         (
-            parse_cfg(&meta_item, self.sess).map_or(true, |meta_item| {
+            parse_cfg(&meta_item, self.sess).is_none_or(|meta_item| {
                 attr::cfg_matches(meta_item, &self.sess, self.lint_node_id, self.features)
             }),
             Some(meta_item),