Auto merge of #46732 - estebank:silence-recovered-blocks, r=petrochenkov

Do not emit type errors on recovered blocks

When a parse error occurs on a block, the parser will recover and create
a block with the statements collected until that point. Now a flag
stating that a recovery has been performed in this block is propagated
so that the type checker knows that the type of the block (which will be
identified as `()`) shouldn't be checked against the expectation to
reduce the amount of irrelevant diagnostic errors shown to the user.

Fix #44579.

src/test/compile-fail/issue-34334.rs

@@ -11,5 +11,4 @@
 fn main () {
     let sr: Vec<(u32, _, _) = vec![]; //~ ERROR expected one of `,` or `>`, found `=`
     let sr2: Vec<(u32, _, _)> = sr.iter().map(|(faction, th_sender, th_receiver)| {}).collect();
-    //~^ ERROR cannot find value `sr` in this scope
 }

src/test/parse-fail/issue-22647.rs

@@ -16,7 +16,6 @@ fn main() {
         println!("Y {}",x);
         return x;
     };
-    //~^ ERROR expected item, found `;`
 
     caller(bar_handler);
 }

src/test/parse-fail/keywords-followed-by-double-colon.rs

@@ -11,6 +11,10 @@
 // compile-flags: -Z parse-only
 
 fn main() {
-    struct::foo();  //~ ERROR expected identifier
-    mut::baz(); //~ ERROR expected expression, found keyword `mut`
+    struct::foo();
+    //~^ ERROR expected identifier
+}
+fn bar() {
+    mut::baz();
+    //~^ ERROR expected expression, found keyword `mut`
 }

src/test/parse-fail/mut-patterns.rs

@@ -15,5 +15,4 @@
 pub fn main() {
     struct Foo { x: isize }
     let mut Foo { x: x } = Foo { x: 3 }; //~ ERROR: expected one of `:`, `;`, `=`, or `@`, found `{`
-    //~^ ERROR expected item, found `=`
 }

src/test/run-pass-fulldeps/pprust-expr-roundtrip.rs

@@ -131,6 +131,7 @@ fn iter_exprs(depth: usize, f: &mut FnMut(P<Expr>)) {
                     id: DUMMY_NODE_ID,
                     rules: BlockCheckMode::Default,
                     span: DUMMY_SP,
+                    recovered: false,
                 });
                 iter_exprs(depth - 1, &mut |e| g(ExprKind::If(e, block.clone(), None)));
             },

src/test/ui/impossible_range.rs

@@ -17,11 +17,13 @@ pub fn main() {
     0..;
     ..1;
     0..1;
-
     ..=; //~ERROR inclusive range with no end
-    0..=; //~ERROR inclusive range with no end
-    ..=1;
-    0..=1;
+         //~^HELP bounded at the end
 }
 
-
+fn _foo1() {
+    ..=1;
+    0..=1;
+    0..=; //~ERROR inclusive range with no end
+          //~^HELP bounded at the end
+}

src/test/ui/impossible_range.stderr

@@ -1,15 +1,15 @@
 error[E0586]: inclusive range with no end
-  --> $DIR/impossible_range.rs:21:8
+  --> $DIR/impossible_range.rs:20:8
    |
-21 |     ..=; //~ERROR inclusive range with no end
+20 |     ..=; //~ERROR inclusive range with no end
    |        ^
    |
    = help: inclusive ranges must be bounded at the end (`..=b` or `a..=b`)
 
 error[E0586]: inclusive range with no end
-  --> $DIR/impossible_range.rs:22:9
+  --> $DIR/impossible_range.rs:27:9
    |
-22 |     0..=; //~ERROR inclusive range with no end
+27 |     0..=; //~ERROR inclusive range with no end
    |         ^
    |
    = help: inclusive ranges must be bounded at the end (`..=b` or `a..=b`)

src/test/ui/issue-44406.stderr

@@ -13,5 +13,3 @@ error: expected type, found keyword `true`
 18 |     foo!(true); //~ ERROR expected type, found keyword
    |          ^^^^ expecting a type here because of type ascription
 
-error: aborting due to 2 previous errors
-

src/test/ui/macro-context.stderr

@@ -43,5 +43,3 @@ error: expected expression, found reserved keyword `typeof`
 26 |     m!();
    |     ----- in this macro invocation
 
-error: aborting due to 4 previous errors
-

src/test/ui/mismatched_types/recovered-block.rs

@@ -0,0 +1,31 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::env;
+
+pub struct Foo {
+    text: String
+}
+
+pub fn foo() -> Foo {
+    let args: Vec<String> = env::args().collect();
+    let text = args[1].clone();
+
+    pub Foo { text }
+}
+//~^^ ERROR missing `struct` for struct definition
+
+pub fn bar() -> Foo {
+    fn
+    Foo { text: "".to_string() }
+}
+//~^^ ERROR expected one of `(` or `<`, found `{`
+
+fn main() {}

src/test/ui/mismatched_types/recovered-block.stderr

@@ -0,0 +1,18 @@
+error: missing `struct` for struct definition
+  --> $DIR/recovered-block.rs:21:8
+   |
+21 |     pub Foo { text }
+   |        ^
+help: add `struct` here to parse `Foo` as a public struct
+   |
+21 |     pub struct Foo { text }
+   |         ^^^^^^
+
+error: expected one of `(` or `<`, found `{`
+  --> $DIR/recovered-block.rs:27:9
+   |
+27 |     Foo { text: "".to_string() }
+   |         ^ expected one of `(` or `<` here
+
+error: aborting due to 2 previous errors
+

src/test/ui/resolve/token-error-correct.rs

@@ -16,4 +16,3 @@ fn main() {
 }
 //~^ ERROR: incorrect close delimiter: `}`
 //~| ERROR: incorrect close delimiter: `}`
-//~| ERROR: expected expression, found `)`

src/test/ui/resolve/token-error-correct.stderr

@@ -28,11 +28,5 @@ error: expected expression, found `;`
 14 |     foo(bar(;
    |             ^
 
-error: expected expression, found `)`
-  --> $DIR/token-error-correct.rs:16:1
-   |
-16 | }
-   | ^
-
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors