Auto merge of #65838 - estebank:resilient-recovery, r=Centril

Reduce amount of errors given unclosed delimiter

When in a file with a non-terminated item, catch the error and consume
the block instead of trying to recover it on a more granular way in order to
reduce the amount of unrelated errors that would be fixed after adding
the missing closing brace. Also point out the possible location of the
missing closing brace.

Fix #63690.

9 files changed, 132 insertions, 33 deletions

diff --git a/src/test/ui/parser/issue-2354.rs b/src/test/ui/parser/issue-2354.rs
index a14eb6e32fc..c4fc4716182 100644
--- a/src/test/ui/parser/issue-2354.rs
+++ b/src/test/ui/parser/issue-2354.rs
@@ -1,7 +1,4 @@
 fn foo() { //~ NOTE un-closed delimiter
-//~^ ERROR `main` function not found
-//~^^ NOTE main function must be defined
-//~^^^ NOTE you have one or more functions
   match Some(10) {
   //~^ NOTE this delimiter might not be properly closed...
       Some(y) => { panic!(); }
@@ -14,5 +11,5 @@ fn bar() {
     while (i < 1000) {}
 }
 
-fn main() {} //~ NOTE here is a function named `main`
-             //~ ERROR this file contains an un-closed delimiter
+fn main() {}
+//~ ERROR this file contains an un-closed delimiter
diff --git a/src/test/ui/parser/issue-2354.stderr b/src/test/ui/parser/issue-2354.stderr
index 038e3dcfa40..45199b02cb8 100644
--- a/src/test/ui/parser/issue-2354.stderr
+++ b/src/test/ui/parser/issue-2354.stderr
@@ -1,9 +1,8 @@
 error: this file contains an un-closed delimiter
-  --> $DIR/issue-2354.rs:18:66
+  --> $DIR/issue-2354.rs:15:53
    |
 LL | fn foo() {
    |          - un-closed delimiter
-...
 LL |   match Some(10) {
    |                  - this delimiter might not be properly closed...
 ...
@@ -11,28 +10,7 @@ LL | }
    | - ...as it matches this but it has different indentation
 ...
 LL |
-   |                                                                  ^
-
-error[E0601]: `main` function not found in crate `issue_2354`
-  --> $DIR/issue-2354.rs:1:1
-   |
-LL | / fn foo() {
-LL | |
-LL | |
-LL | |
-...  |
-LL | | fn main() {}
-LL | |
-   | |_________________________________________________________________^ the main function must be defined at the crate level (in `$DIR/issue-2354.rs`)
-   |
-note: here is a function named `main`
-  --> $DIR/issue-2354.rs:17:1
-   |
-LL | fn main() {}
-   | ^^^^^^^^^^^^
-   = note: you have one or more functions named `main` not defined at the crate level
-   = help: either move the `main` function definitions or attach the `#[main]` attribute to one of them
+   |                                                     ^
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0601`.
diff --git a/src/test/ui/parser/issue-62973.stderr b/src/test/ui/parser/issue-62973.stderr
index e73776dc7b4..82122ef0b6f 100644
--- a/src/test/ui/parser/issue-62973.stderr
+++ b/src/test/ui/parser/issue-62973.stderr
@@ -13,9 +13,11 @@ error: expected one of `,` or `}`, found `{`
   --> $DIR/issue-62973.rs:6:25
    |
 LL | fn p() { match s { v, E { [) {) }
-   |                -        ^ expected one of `,` or `}` here
-   |                |
-   |                while parsing this struct
+   |        -       -       -^ expected one of `,` or `}` here
+   |        |       |       |
+   |        |       |       help: `}` may belong here
+   |        |       while parsing this struct
+   |        unclosed delimiter
 
 error: struct literals are not allowed here
   --> $DIR/issue-62973.rs:6:16
diff --git a/src/test/ui/parser/mismatched-braces/missing-close-brace-in-impl-trait.rs b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-impl-trait.rs
new file mode 100644
index 00000000000..8d89905909e
--- /dev/null
+++ b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-impl-trait.rs
@@ -0,0 +1,12 @@
+impl T for () { //~ ERROR cannot find trait `T` in this scope
+
+fn foo(&self) {}
+
+trait T { //~ ERROR expected one of
+    fn foo(&self);
+}
+
+pub(crate) struct Bar<T>();
+
+fn main() {}
+//~ ERROR this file contains an un-closed delimiter
diff --git a/src/test/ui/parser/mismatched-braces/missing-close-brace-in-impl-trait.stderr b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-impl-trait.stderr
new file mode 100644
index 00000000000..9bf54181a07
--- /dev/null
+++ b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-impl-trait.stderr
@@ -0,0 +1,33 @@
+error: this file contains an un-closed delimiter
+  --> $DIR/missing-close-brace-in-impl-trait.rs:12:53
+   |
+LL | impl T for () {
+   |               - un-closed delimiter
+...
+LL |
+   |                                                     ^
+
+error: expected one of `async`, `const`, `crate`, `default`, `extern`, `fn`, `pub`, `type`, `unsafe`, or `}`, found keyword `trait`
+  --> $DIR/missing-close-brace-in-impl-trait.rs:5:1
+   |
+LL | impl T for () {
+   |               - unclosed delimiter
+LL | 
+LL | fn foo(&self) {}
+   |                 -
+   |                 |
+   |                 expected one of 10 possible tokens here
+   |                 help: `}` may belong here
+LL | 
+LL | trait T {
+   | ^^^^^ unexpected token
+
+error[E0405]: cannot find trait `T` in this scope
+  --> $DIR/missing-close-brace-in-impl-trait.rs:1:6
+   |
+LL | impl T for () {
+   |      ^ not found in this scope
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0405`.
diff --git a/src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.rs b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.rs
new file mode 100644
index 00000000000..5b716b1467c
--- /dev/null
+++ b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.rs
@@ -0,0 +1,14 @@
+pub(crate) struct Bar<T> {
+  foo: T,
+
+trait T { //~ ERROR expected identifier, found keyword `trait`
+//~^ ERROR expected `:`, found `T`
+    fn foo(&self);
+}
+
+
+impl T for Bar<usize> {
+fn foo(&self) {}
+}
+
+fn main() {} //~ ERROR this file contains an un-closed delimiter
diff --git a/src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.stderr b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.stderr
new file mode 100644
index 00000000000..ce399dbbf45
--- /dev/null
+++ b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-struct.stderr
@@ -0,0 +1,28 @@
+error: this file contains an un-closed delimiter
+  --> $DIR/missing-close-brace-in-struct.rs:14:66
+   |
+LL | pub(crate) struct Bar<T> {
+   |                          - un-closed delimiter
+...
+LL | fn main() {}
+   |                                                                  ^
+
+error: expected identifier, found keyword `trait`
+  --> $DIR/missing-close-brace-in-struct.rs:4:1
+   |
+LL | trait T {
+   | ^^^^^ expected identifier, found keyword
+   |
+help: you can escape reserved keywords to use them as identifiers
+   |
+LL | r#trait T {
+   | ^^^^^^^
+
+error: expected `:`, found `T`
+  --> $DIR/missing-close-brace-in-struct.rs:4:7
+   |
+LL | trait T {
+   |       ^ expected `:`
+
+error: aborting due to 3 previous errors
+
diff --git a/src/test/ui/parser/mismatched-braces/missing-close-brace-in-trait.rs b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-trait.rs
new file mode 100644
index 00000000000..79547195411
--- /dev/null
+++ b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-trait.rs
@@ -0,0 +1,10 @@
+trait T {
+    fn foo(&self);
+
+pub(crate) struct Bar<T>(); //~ ERROR expected one of
+
+impl T for Bar<usize> {
+fn foo(&self) {}
+}
+
+fn main() {} //~ ERROR this file contains an un-closed delimiter
diff --git a/src/test/ui/parser/mismatched-braces/missing-close-brace-in-trait.stderr b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-trait.stderr
new file mode 100644
index 00000000000..4bfb4c1cb3a
--- /dev/null
+++ b/src/test/ui/parser/mismatched-braces/missing-close-brace-in-trait.stderr
@@ -0,0 +1,25 @@
+error: this file contains an un-closed delimiter
+  --> $DIR/missing-close-brace-in-trait.rs:10:66
+   |
+LL | trait T {
+   |         - un-closed delimiter
+...
+LL | fn main() {}
+   |                                                                  ^
+
+error: expected one of `async`, `const`, `extern`, `fn`, `type`, `unsafe`, or `}`, found keyword `pub`
+  --> $DIR/missing-close-brace-in-trait.rs:4:1
+   |
+LL | trait T {
+   |         - unclosed delimiter
+LL |     fn foo(&self);
+   |                   -
+   |                   |
+   |                   expected one of 7 possible tokens here
+   |                   help: `}` may belong here
+LL | 
+LL | pub(crate) struct Bar<T>();
+   | ^^^ unexpected token
+
+error: aborting due to 2 previous errors
+