error: expected expression, found `+`
  --> $DIR/expr-as-stmt.rs:8:9
   |
LL |     {2} + {2}
   |         ^ expected expression
   |
help: parentheses are required to parse this as an expression
   |
LL |     ({2}) + {2}
   |     +   +

error: leading `+` is not supported
  --> $DIR/expr-as-stmt.rs:13:9
   |
LL |     {2} + 2
   |         ^ unexpected `+`
   |
help: parentheses are required to parse this as an expression
   |
LL |     ({2}) + 2
   |     +   +

error: expected expression, found `+`
  --> $DIR/expr-as-stmt.rs:19:12
   |
LL |     { 42 } + foo;
   |            ^ expected expression
   |
help: parentheses are required to parse this as an expression
   |
LL |     ({ 42 }) + foo;
   |     +      +

error: expected expression, found `>`
  --> $DIR/expr-as-stmt.rs:32:7
   |
LL |     } > 0
   |       ^ expected expression
   |
help: parentheses are required to parse this as an expression
   |
LL ~     (match x {
LL |         _ => 1,
LL ~     }) > 0
   |

error: expected parameter name, found `{`
  --> $DIR/expr-as-stmt.rs:41:16
   |
LL |     { true } | { true }
   |                ^ expected parameter name
   |
help: parentheses are required to parse this as an expression
   |
LL |     ({ true }) | { true }
   |     +        +

error: expected expression, found `+`
  --> $DIR/expr-as-stmt.rs:69:26
   |
LL |     match () { () => 1 } + match () { () => 1 }
   |                          ^ expected expression
   |
help: parentheses are required to parse this as an expression
   |
LL |     (match () { () => 1 }) + match () { () => 1 }
   |     +                    +

error: expected expression, found `+`
  --> $DIR/expr-as-stmt.rs:75:18
   |
LL |     unsafe { 1 } + unsafe { 1 }
   |                  ^ expected expression
   |
help: parentheses are required to parse this as an expression
   |
LL |     (unsafe { 1 }) + unsafe { 1 }
   |     +            +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:64:7
   |
LL |     { foo() } || { true }
   |       ^^^^^- help: consider using a semicolon here: `;`
   |       |
   |       expected `()`, found `i32`

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:8:6
   |
LL |     {2} + {2}
   |      ^ expected `()`, found integer
   |
help: you might have meant to return this value
   |
LL |     {return 2;} + {2}
   |      ++++++  +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:13:6
   |
LL |     {2} + 2
   |      ^ expected `()`, found integer
   |
help: you might have meant to return this value
   |
LL |     {return 2;} + 2
   |      ++++++  +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:19:7
   |
LL |     { 42 } + foo;
   |       ^^ expected `()`, found integer
   |
help: you might have meant to return this value
   |
LL |     { return 42; } + foo;
   |       ++++++   +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:25:7
   |
LL |     { 3 } * 3
   |       ^ expected `()`, found integer
   |
help: you might have meant to return this value
   |
LL |     { return 3; } * 3
   |       ++++++  +

error[E0614]: type `{integer}` cannot be dereferenced
  --> $DIR/expr-as-stmt.rs:25:11
   |
LL |     { 3 } * 3
   |           ^^^
   |
help: parentheses are required to parse this as an expression
   |
LL |     ({ 3 }) * 3
   |     +     +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:36:6
   |
LL |     {2} - 2
   |      ^ expected `()`, found integer
   |
help: you might have meant to return this value
   |
LL |     {return 2;} - 2
   |      ++++++  +

error[E0600]: cannot apply unary operator `-` to type `u32`
  --> $DIR/expr-as-stmt.rs:36:9
   |
LL |     {2} - 2
   |         ^^^ cannot apply unary operator `-`
   |
help: parentheses are required to parse this as an expression
   |
LL |     ({2}) - 2
   |     +   +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:41:7
   |
LL |     { true } | { true }
   |       ^^^^ expected `()`, found `bool`
   |
help: you might have meant to return this value
   |
LL |     { return true; } | { true }
   |       ++++++     +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:46:7
   |
LL |     { true } && { true }
   |       ^^^^ expected `()`, found `bool`
   |
help: you might have meant to return this value
   |
LL |     { return true; } && { true }
   |       ++++++     +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:46:14
   |
LL | fn revenge_from_mars() -> bool {
   |                           ---- expected `bool` because of return type
LL |     { true } && { true }
   |              ^^^^^^^^^^^ expected `bool`, found `&&bool`
   |
help: parentheses are required to parse this as an expression
   |
LL |     ({ true }) && { true }
   |     +        +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:51:7
   |
LL |     { true } || { true }
   |       ^^^^ expected `()`, found `bool`
   |
help: you might have meant to return this value
   |
LL |     { return true; } || { true }
   |       ++++++     +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:51:14
   |
LL | fn attack_from_mars() -> bool {
   |                          ---- expected `bool` because of return type
LL |     { true } || { true }
   |              ^^^^^^^^^^^ expected `bool`, found closure
   |
   = note: expected type `bool`
           found closure `[closure@$DIR/expr-as-stmt.rs:51:14: 51:16]`
help: parentheses are required to parse this as an expression
   |
LL |     ({ true }) || { true }
   |     +        +

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:69:5
   |
LL |     match () { () => 1 } + match () { () => 1 }
   |     ^^^^^^^^^^^^^^^^^^^^- help: consider using a semicolon here
   |     |
   |     expected `()`, found integer

error[E0308]: mismatched types
  --> $DIR/expr-as-stmt.rs:75:14
   |
LL |     unsafe { 1 } + unsafe { 1 }
   |              ^ expected `()`, found integer
   |
help: you might have meant to return this value
   |
LL |     unsafe { return 1; } + unsafe { 1 }
   |              ++++++  +

error: aborting due to 22 previous errors

Some errors have detailed explanations: E0308, E0600, E0614.
For more information about an error, try `rustc --explain E0308`.