replaced some unwrap_or with unwrap_or_else

Author: klensy

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -2082,7 +2082,7 @@ fn add_upstream_rust_crates<'a, B: ArchiveBuilder<'a>>(
         let filestem = cratepath.file_stem().unwrap().to_str().unwrap();
         cmd.link_rust_dylib(
             Symbol::intern(&unlib(&sess.target, filestem)),
-            parent.unwrap_or(Path::new("")),
+            parent.unwrap_or_else(|| Path::new("")),
         );
     }
 }

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -159,7 +159,7 @@ fn check_panic_str<'tcx>(
             Some(v) if v.len() == 1 => "panic message contains a brace",
             _ => "panic message contains braces",
         };
-        cx.struct_span_lint(NON_FMT_PANIC, brace_spans.unwrap_or(vec![span]), |lint| {
+        cx.struct_span_lint(NON_FMT_PANIC, brace_spans.unwrap_or_else(|| vec![span]), |lint| {
             let mut l = lint.build(msg);
             l.note("this message is not used as a format string, but will be in Rust 2021");
             if span.contains(arg.span) {

compiler/rustc_macros/src/query.rs

@@ -378,14 +378,14 @@ fn add_query_description_impl(
                 let t = &(t.0).0;
                 quote! { #t }
             })
-            .unwrap_or(quote! { _ });
+            .unwrap_or_else(|| quote! { _ });
         let value = args
             .as_ref()
             .map(|t| {
                 let t = &(t.1).0;
                 quote! { #t }
             })
-            .unwrap_or(quote! { _ });
+            .unwrap_or_else(|| quote! { _ });
         // expr is a `Block`, meaning that `{ #expr }` gets expanded
         // to `{ { stmts... } }`, which triggers the `unused_braces` lint.
         quote! {

compiler/rustc_macros/src/session_diagnostic.rs

@@ -473,9 +473,9 @@ impl<'a> SessionDiagnosticDeriveBuilder<'a> {
                                         .map(
                                             |applicability_idx| quote!(#binding.#applicability_idx),
                                         )
-                                        .unwrap_or(quote!(
-                                            rustc_errors::Applicability::Unspecified
-                                        ));
+                                        .unwrap_or_else(|| {
+                                            quote!(rustc_errors::Applicability::Unspecified)
+                                        });
                                     return Ok((span, applicability));
                                 }
                                 throw_span_err!(

compiler/rustc_session/src/filesearch.rs

@@ -169,7 +169,7 @@ pub fn get_or_default_sysroot() -> PathBuf {
 
     // Check if sysroot is found using env::args().next(), and if is not found,
     // use env::current_exe() to imply sysroot.
-    from_env_args_next().unwrap_or(from_current_exe())
+    from_env_args_next().unwrap_or_else(|| from_current_exe())
 }
 
 // The name of the directory rustc expects libraries to be located.

compiler/rustc_typeck/src/check/writeback.rs

@@ -348,9 +348,9 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
                 let min_list_wb = min_list
                     .iter()
                     .map(|captured_place| {
-                        let locatable = captured_place.info.path_expr_id.unwrap_or(
-                            self.tcx().hir().local_def_id_to_hir_id(closure_def_id.expect_local()),
-                        );
+                        let locatable = captured_place.info.path_expr_id.unwrap_or_else(|| {
+                            self.tcx().hir().local_def_id_to_hir_id(closure_def_id.expect_local())
+                        });
 
                         self.resolve(captured_place.clone(), &locatable)
                     })