fix: correctly reconstruct raw strings

Author: yaahc

clippy_lints/src/strings.rs

@@ -7,7 +7,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-
 use crate::rustc::hir::*;
 use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use crate::rustc::{declare_tool_lint, lint_array};
@@ -164,15 +163,20 @@ impl LintPass for StringLitAsBytes {
 
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for StringLitAsBytes {
     fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
-        use crate::syntax::ast::LitKind;
+        use crate::syntax::ast::{LitKind, StrStyle};
         use crate::utils::{in_macro, snippet};
 
         if let ExprKind::MethodCall(ref path, _, ref args) = e.node {
             if path.ident.name == "as_bytes" {
                 if let ExprKind::Lit(ref lit) = args[0].node {
-                    if let LitKind::Str(ref lit_content, _) = lit.node {
+                    if let LitKind::Str(ref lit_content, style) = lit.node {
                         let callsite = snippet(cx, args[0].span.source_callsite(), r#""foo""#);
-                        let expanded = format!("\"{}\"", lit_content.as_str());
+                        let expanded = if let StrStyle::Raw(n) = style {
+                            let term = (0..n).map(|_| '#').collect::<String>();
+                            format!("r{0}\"{1}\"{0}", term, lit_content.as_str())
+                        } else {
+                            format!("\"{}\"", lit_content.as_str())
+                        };
                         if callsite.starts_with("include_str!") {
                             span_lint_and_sugg(
                                 cx,

tests/ui/strings.stderr

@@ -60,3 +60,17 @@ error: calling `as_bytes()` on a string literal
    |
    = note: `-D clippy::string-lit-as-bytes` implied by `-D warnings`
 
+error: calling `as_bytes()` on a string literal
+  --> $DIR/strings.rs:62:14
+   |
+62 |     let bs = r###"raw string with three ### in it and some " ""###.as_bytes();
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using a byte string literal instead: `br###"raw string with three ### in it and some " ""###`
+
+error: calling `as_bytes()` on `include_str!(..)`
+  --> $DIR/strings.rs:69:22
+   |
+69 |     let includestr = include_str!("entry.rs").as_bytes();
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `include_bytes!(..)` instead: `include_bytes!("entry.rs")`
+
+error: aborting due to 11 previous errors
+