Replace option.map(cond) == Some(true) with option.is_some_and(cond)

Author: dtolnay

compiler/rustc_codegen_cranelift/scripts/rustc-clif.rs

@@ -27,7 +27,7 @@ fn main() {
         args.push(codegen_backend_arg);
     }
     if !passed_args.iter().any(|arg| {
-        arg == "--sysroot" || arg.to_str().map(|s| s.starts_with("--sysroot=")) == Some(true)
+        arg == "--sysroot" || arg.to_str().is_some_and(|s| s.starts_with("--sysroot="))
     }) {
         args.push(OsString::from("--sysroot"));
         args.push(OsString::from(sysroot.to_str().unwrap()));

compiler/rustc_codegen_cranelift/scripts/rustdoc-clif.rs

@@ -27,7 +27,7 @@ fn main() {
         args.push(codegen_backend_arg);
     }
     if !passed_args.iter().any(|arg| {
-        arg == "--sysroot" || arg.to_str().map(|s| s.starts_with("--sysroot=")) == Some(true)
+        arg == "--sysroot" || arg.to_str().is_some_and(|s| s.starts_with("--sysroot="))
     }) {
         args.push(OsString::from("--sysroot"));
         args.push(OsString::from(sysroot.to_str().unwrap()));

compiler/rustc_expand/src/tests.rs

@@ -135,7 +135,7 @@ pub(crate) fn matches_codepattern(a: &str, b: &str) -> bool {
 
 /// Advances the given peekable `Iterator` until it reaches a non-whitespace character.
 fn scan_for_non_ws_or_end<I: Iterator<Item = char>>(iter: &mut Peekable<I>) {
-    while iter.peek().copied().map(rustc_lexer::is_whitespace) == Some(true) {
+    while iter.peek().copied().is_some_and(rustc_lexer::is_whitespace) {
         iter.next();
     }
 }

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -2293,12 +2293,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         let clone_trait =
                             self.tcx.require_lang_item(LangItem::Clone, Some(segment.ident.span));
                         if args.is_empty()
-                            && self.typeck_results.borrow().type_dependent_def_id(expr.hir_id).map(
-                                |did| {
+                            && self
+                                .typeck_results
+                                .borrow()
+                                .type_dependent_def_id(expr.hir_id)
+                                .is_some_and(|did| {
                                     let ai = self.tcx.associated_item(did);
                                     ai.trait_container(self.tcx) == Some(clone_trait)
-                                },
-                            ) == Some(true)
+                                })
                             && segment.ident.name == sym::clone
                         {
                             // If this expression had a clone call when suggesting borrowing

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/util.rs

@@ -161,7 +161,6 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
             && self
                 .tcx()
                 .opt_associated_item(scope_def_id.to_def_id())
-                .map(|i| i.fn_has_self_parameter)
-                == Some(true)
+                .is_some_and(|i| i.fn_has_self_parameter)
     }
 }

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -154,17 +154,13 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
 
             let infcx = cx.tcx.infer_ctxt().build();
             let suggest_display = is_str
-                || cx
-                    .tcx
-                    .get_diagnostic_item(sym::Display)
-                    .map(|t| infcx.type_implements_trait(t, [ty], cx.param_env).may_apply())
-                    == Some(true);
+                || cx.tcx.get_diagnostic_item(sym::Display).is_some_and(|t| {
+                    infcx.type_implements_trait(t, [ty], cx.param_env).may_apply()
+                });
             let suggest_debug = !suggest_display
-                && cx
-                    .tcx
-                    .get_diagnostic_item(sym::Debug)
-                    .map(|t| infcx.type_implements_trait(t, [ty], cx.param_env).may_apply())
-                    == Some(true);
+                && cx.tcx.get_diagnostic_item(sym::Debug).is_some_and(|t| {
+                    infcx.type_implements_trait(t, [ty], cx.param_env).may_apply()
+                });
 
             let suggest_panic_any = !is_str && panic == sym::std_panic_macro;
 

src/librustdoc/html/render/print_item.rs

@@ -596,8 +596,10 @@ fn extra_info_tags<'a, 'tcx: 'a>(
 
         // The "rustc_private" crates are permanently unstable so it makes no sense
         // to render "unstable" everywhere.
-        if item.stability(tcx).as_ref().map(|s| s.is_unstable() && s.feature != sym::rustc_private)
-            == Some(true)
+        if item
+            .stability(tcx)
+            .as_ref()
+            .is_some_and(|s| s.is_unstable() && s.feature != sym::rustc_private)
         {
             write!(f, "{}", tag_html("unstable", "", "Experimental"))?;
         }

src/tools/compiletest/src/header.rs

@@ -632,7 +632,7 @@ fn iter_header_extra(
         it(None, directive, 0);
     }
 
-    let comment = if testfile.extension().map(|e| e == "rs") == Some(true) { "//" } else { "#" };
+    let comment = if testfile.extension().is_some_and(|e| e == "rs") { "//" } else { "#" };
 
     let mut rdr = BufReader::new(rdr);
     let mut ln = String::new();

src/tools/rust-analyzer/crates/ide-assists/src/handlers/toggle_ignore.rs

@@ -55,7 +55,7 @@ pub(crate) fn toggle_ignore(acc: &mut Assists, ctx: &AssistContext<'_>) -> Optio
 }
 
 fn has_ignore_attribute(fn_def: &ast::Fn) -> Option<ast::Attr> {
-    fn_def.attrs().find(|attr| attr.path().map(|it| it.syntax().text() == "ignore") == Some(true))
+    fn_def.attrs().find(|attr| attr.path().is_some_and(|it| it.syntax().text() == "ignore"))
 }
 
 #[cfg(test)]

src/tools/rust-analyzer/crates/ide/src/extend_selection.rs

@@ -108,7 +108,7 @@ fn try_extend_selection(
 
     let node = shallowest_node(&node);
 
-    if node.parent().map(|n| list_kinds.contains(&n.kind())) == Some(true) {
+    if node.parent().is_some_and(|n| list_kinds.contains(&n.kind())) {
         if let Some(range) = extend_list_item(&node) {
             return Some(range);
         }

src/tools/rust-analyzer/crates/rust-analyzer/tests/slow-tests/tidy.rs

@@ -316,7 +316,7 @@ fn check_trailing_ws(path: &Path, text: &str) {
         return;
     }
     for (line_number, line) in text.lines().enumerate() {
-        if line.chars().last().map(char::is_whitespace) == Some(true) {
+        if line.chars().last().is_some_and(char::is_whitespace) {
             panic!("Trailing whitespace in {} at line {}", path.display(), line_number + 1)
         }
     }