Fix rustdoc error with no providec crate-type, fix scrape examples button colors w/ themes

src/librustdoc/core.rs

@@ -13,7 +13,7 @@ use rustc_interface::interface;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
 use rustc_resolve as resolve;
-use rustc_session::config::{self, ErrorOutputType};
+use rustc_session::config::{self, CrateType, ErrorOutputType};
 use rustc_session::lint;
 use rustc_session::Session;
 use rustc_span::symbol::sym;
@@ -247,6 +247,7 @@ pub(crate) fn create_config(
         Some((lint.name_lower(), lint::Allow))
     });
 
+    let crate_types = if crate_types.is_empty() { vec![CrateType::Rlib] } else { crate_types };
     let test = scrape_examples_options.map(|opts| opts.scrape_tests).unwrap_or(false);
     // plays with error output here!
     let sessopts = config::Options {

src/librustdoc/doctest.rs

@@ -12,7 +12,7 @@ use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::TyCtxt;
 use rustc_parse::maybe_new_parser_from_source_str;
 use rustc_parse::parser::attr::InnerAttrPolicy;
-use rustc_session::config::{self, ErrorOutputType};
+use rustc_session::config::{self, CrateType, ErrorOutputType};
 use rustc_session::parse::ParseSess;
 use rustc_session::{lint, Session};
 use rustc_span::edition::Edition;
@@ -68,7 +68,11 @@ pub(crate) fn run(options: RustdocOptions) -> Result<(), ErrorGuaranteed> {
 
     debug!(?lint_opts);
 
-    let crate_types = options.crate_types.clone();
+    let crate_types = if options.crate_types.is_empty() {
+        vec![CrateType::Rlib]
+    } else {
+        options.crate_types.clone()
+    };
 
     let sessopts = config::Options {
         maybe_sysroot: options.maybe_sysroot.clone(),

src/librustdoc/html/static/css/rustdoc.css

@@ -1948,6 +1948,7 @@ in storage.js
 .scraped-example .code-wrapper .next,
 .scraped-example .code-wrapper .prev,
 .scraped-example .code-wrapper .expand {
+	color: var(--main-color);
 	position: absolute;
 	top: 0.25em;
 	z-index: 1;