error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:11:16
   |
LL |   const _: i32 = if true {
   |  ________________^
LL | |     5
LL | | } else {
LL | |     6
LL | | };
   | |_^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:17:16
   |
LL |   const _: i32 = if let Some(true) = Some(false) {
   |  ________________^
LL | |     0
LL | | } else {
LL | |     1
LL | | };
   | |_^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:23:16
   |
LL |   const _: i32 = match 1 {
   |  ________________^
LL | |     2 => 3,
LL | |     4 => 5,
LL | |     _ => 0,
LL | | };
   | |_^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `static`
  --> $DIR/feature-gate-const-if-match.rs:30:13
   |
LL |     let x = if true { 0 } else { 1 };
   |             ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `static`
  --> $DIR/feature-gate-const-if-match.rs:32:13
   |
LL |     let x = match x { 0 => 1, _ => 0 };
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `static`
  --> $DIR/feature-gate-const-if-match.rs:34:5
   |
LL |     if let Some(x) = Some(x) { x } else { 1 }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `static mut`
  --> $DIR/feature-gate-const-if-match.rs:39:13
   |
LL |     let x = if true { 0 } else { 1 };
   |             ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `static mut`
  --> $DIR/feature-gate-const-if-match.rs:41:13
   |
LL |     let x = match x { 0 => 1, _ => 0 };
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `static mut`
  --> $DIR/feature-gate-const-if-match.rs:43:5
   |
LL |     if let Some(x) = Some(x) { x } else { 1 }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const fn`
  --> $DIR/feature-gate-const-if-match.rs:48:5
   |
LL |     if true { 5 } else { 6 }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const fn`
  --> $DIR/feature-gate-const-if-match.rs:52:5
   |
LL | /     if let Some(true) = a {
LL | |         0
LL | |     } else {
LL | |         1
LL | |     }
   | |_____^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `const fn`
  --> $DIR/feature-gate-const-if-match.rs:60:5
   |
LL | /     match i {
LL | |         i if i > 10 => i,
LL | |         1 => 2,
LL | |         _ => 0
LL | |     }
   | |_____^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const fn`
  --> $DIR/feature-gate-const-if-match.rs:91:17
   |
LL |         let x = if y { 0 } else { 1 };
   |                 ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `const fn`
  --> $DIR/feature-gate-const-if-match.rs:93:17
   |
LL |         let x = match x { 0 => 1, _ => 0 };
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const fn`
  --> $DIR/feature-gate-const-if-match.rs:95:9
   |
LL |         if let Some(x) = Some(x) { x } else { 1 }
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:111:17
   |
LL |         let x = if false { 0 } else { 1 };
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:113:17
   |
LL |         let x = match x { 0 => 1, _ => 0 };
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:115:9
   |
LL |         if let Some(x) = Some(x) { x } else { 1 }
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:68:21
   |
LL |     const IF: i32 = if true { 5 } else { 6 };
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:71:25
   |
LL |     const IF_LET: i32 = if let Some(true) = None { 5 } else { 6 };
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:74:24
   |
LL |     const MATCH: i32 = match 0 { 1 => 2, _ => 0 };
   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:79:21
   |
LL |     const IF: i32 = if true { 5 } else { 6 };
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `if` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:82:25
   |
LL |     const IF_LET: i32 = if let Some(true) = None { 5 } else { 6 };
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0658]: `match` is not allowed in a `const`
  --> $DIR/feature-gate-const-if-match.rs:85:24
   |
LL |     const MATCH: i32 = match 0 { 1 => 2, _ => 0 };
   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/49146
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

error[E0019]: constant contains unimplemented expression type
  --> $DIR/feature-gate-const-if-match.rs:115:21
   |
LL |         if let Some(x) = Some(x) { x } else { 1 }
   |                     ^

error: aborting due to 25 previous errors

Some errors have detailed explanations: E0019, E0658.
For more information about an error, try `rustc --explain E0019`.