Rollup merge of #39420 - oli-obk:sugg, r=pnkfelix

parser: use suggestions instead of helps with code in them

src/librustc_const_eval/eval.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//#![allow(non_camel_case_types)]
-
 use rustc::middle::const_val::ConstVal::*;
 use rustc::middle::const_val::ConstVal;
 use self::ErrKind::*;

src/libsyntax/parse/parser.rs

@@ -2456,9 +2456,21 @@ fn parse_dot_or_call_expr_with_(&mut self, e0: P<Expr>, lo: BytePos) -> PResult<
                             Some(f) => f,
                             None => continue,
                         };
-                        err.help(&format!("try parenthesizing the first index; e.g., `(foo.{}){}`",
-                                 float.trunc() as usize,
-                                 format!(".{}", fstr.splitn(2, ".").last().unwrap())));
+                        let sugg = pprust::to_string(|s| {
+                            use print::pprust::PrintState;
+                            use print::pp::word;
+                            s.popen()?;
+                            s.print_expr(&e)?;
+                            word(&mut s.s, ".")?;
+                            s.print_usize(float.trunc() as usize)?;
+                            s.pclose()?;
+                            word(&mut s.s, ".")?;
+                            word(&mut s.s, fstr.splitn(2, ".").last().unwrap())
+                        });
+                        err.span_suggestion(
+                            prev_span,
+                            "try parenthesizing the first index",
+                            sugg);
                     }
                     return Err(err);
 
@@ -3900,7 +3912,14 @@ pub fn parse_block(&mut self) -> PResult<'a, P<Block>> {
                     if self.eat(&token::Semi) {
                         stmt_span.hi = self.prev_span.hi;
                     }
-                    e.span_help(stmt_span, "try placing this code inside a block");
+                    let sugg = pprust::to_string(|s| {
+                        use print::pprust::{PrintState, INDENT_UNIT};
+                        s.ibox(INDENT_UNIT)?;
+                        s.bopen()?;
+                        s.print_stmt(&stmt)?;
+                        s.bclose_maybe_open(stmt.span, INDENT_UNIT, false)
+                    });
+                    e.span_suggestion(stmt_span, "try placing this code inside a block", sugg);
                 }
                 Err(mut e) => {
                     self.recover_stmt_(SemiColonMode::Break);

src/test/compile-fail/missing-block-hint.rs

@@ -15,6 +15,7 @@ fn main() {
     {
         if (foo)
             bar; //~ ERROR expected `{`, found `bar`
-                 //^ HELP try placing this code inside a block
+                 //~^ HELP try placing this code inside a block
+                 //~| SUGGESTION { bar; }
     }
 }

src/test/parse-fail/tuple-float-index.rs

@@ -12,5 +12,6 @@
 
 fn main () {
     (1, (2, 3)).1.1; //~ ERROR unexpected token
-                     //~^ HELP try parenthesizing the first index; e.g., `(foo.1).1`
+                     //~^ HELP try parenthesizing the first index
+                     //~| SUGGESTION ((1, (2, 3)).1).1
 }