error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:29:20
   |
LL | fn foo(a: usize, b: usize) -> usize { a }
   | ----------------------------------- function `foo` defined here
...
LL |     let _: usize = foo;
   |            -----   ^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn(usize, usize) -> usize {foo}`
help: use parentheses to call this function
   |
LL |     let _: usize = foo(/* usize */, /* usize */);
   |                       ++++++++++++++++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:30:16
   |
LL | struct S(usize, usize);
   | -------- `S` defines a struct constructor here, which should be called
...
LL |     let _: S = S;
   |            -   ^ expected `S`, found struct constructor
   |            |
   |            expected due to this
   |
   = note:          expected struct `S`
           found struct constructor `fn(usize, usize) -> S {S}`
help: use parentheses to construct this tuple struct
   |
LL |     let _: S = S(/* usize */, /* usize */);
   |                 ++++++++++++++++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:31:20
   |
LL | fn bar() -> usize { 42 }
   | ----------------- function `bar` defined here
...
LL |     let _: usize = bar;
   |            -----   ^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn() -> usize {bar}`
help: use parentheses to call this function
   |
LL |     let _: usize = bar();
   |                       ++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:32:16
   |
LL | struct V();
   | -------- `V` defines a struct constructor here, which should be called
...
LL |     let _: V = V;
   |            -   ^ expected `V`, found struct constructor
   |            |
   |            expected due to this
   |
   = note:          expected struct `V`
           found struct constructor `fn() -> V {V}`
help: use parentheses to construct this tuple struct
   |
LL |     let _: V = V();
   |                 ++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:33:20
   |
LL |     fn baz(x: usize, y: usize) -> usize { x }
   |     ----------------------------------- associated function `baz` defined here
...
LL |     let _: usize = T::baz;
   |            -----   ^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn(usize, usize) -> usize {<_ as T>::baz}`
help: use parentheses to call this associated function
   |
LL |     let _: usize = T::baz(/* usize */, /* usize */);
   |                          ++++++++++++++++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:34:20
   |
LL |     fn bat(x: usize) -> usize { 42 }
   |     ------------------------- associated function `bat` defined here
...
LL |     let _: usize = T::bat;
   |            -----   ^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn(usize) -> usize {<_ as T>::bat}`
help: use parentheses to call this associated function
   |
LL |     let _: usize = T::bat(/* usize */);
   |                          +++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:35:16
   |
LL |     A(usize),
   |     - `A` defines an enum variant constructor here, which should be called
...
LL |     let _: E = E::A;
   |            -   ^^^^ expected `E`, found enum constructor
   |            |
   |            expected due to this
   |
   = note:          expected enum `E`
           found enum constructor `fn(usize) -> E {E::A}`
help: use parentheses to construct this tuple variant
   |
LL |     let _: E = E::A(/* usize */);
   |                    +++++++++++++

error[E0533]: expected value, found struct variant `E::B`
  --> $DIR/fn-or-tuple-struct-without-args.rs:36:16
   |
LL |     let _: E = E::B;
   |                ^^^^ not a value
   |
help: you might have meant to create a new value of the struct
   |
LL |     let _: E = E::B { a: /* value */ };
   |                     ++++++++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:37:20
   |
LL |     fn baz(x: usize, y: usize) -> usize { x }
   |     ----------------------------------- associated function `baz` defined here
...
LL |     let _: usize = X::baz;
   |            -----   ^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn(usize, usize) -> usize {<X as T>::baz}`
help: use parentheses to call this associated function
   |
LL |     let _: usize = X::baz(/* usize */, /* usize */);
   |                          ++++++++++++++++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:38:20
   |
LL |     fn bat(x: usize) -> usize { 42 }
   |     ------------------------- associated function `bat` defined here
...
LL |     let _: usize = X::bat;
   |            -----   ^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn(usize) -> usize {<X as T>::bat}`
help: use parentheses to call this associated function
   |
LL |     let _: usize = X::bat(/* usize */);
   |                          +++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:39:20
   |
LL |     fn bax(x: usize) -> usize { 42 }
   |     ------------------------- associated function `bax` defined here
...
LL |     let _: usize = X::bax;
   |            -----   ^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn(usize) -> usize {<X as T>::bax}`
help: use parentheses to call this associated function
   |
LL |     let _: usize = X::bax(/* usize */);
   |                          +++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:40:20
   |
LL |     fn bach(x: usize) -> usize;
   |     --------------------------- associated function `bach` defined here
...
LL |     let _: usize = X::bach;
   |            -----   ^^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `fn(usize) -> usize {<X as T>::bach}`
help: use parentheses to call this associated function
   |
LL |     let _: usize = X::bach(/* usize */);
   |                           +++++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:41:20
   |
LL |     fn ban(&self) -> usize { 42 }
   |     ---------------------- method `ban` defined here
...
LL |     let _: usize = X::ban;
   |            -----   ^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `for<'a> fn(&'a X) -> usize {<X as T>::ban}`
help: use parentheses to call this method
   |
LL |     let _: usize = X::ban(/* &X */);
   |                          ++++++++++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:42:20
   |
LL |     fn bal(&self) -> usize;
   |     ----------------------- method `bal` defined here
...
LL |     let _: usize = X::bal;
   |            -----   ^^^^^^ expected `usize`, found fn item
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found fn item `for<'a> fn(&'a X) -> usize {<X as T>::bal}`
help: use parentheses to call this method
   |
LL |     let _: usize = X::bal(/* &X */);
   |                          ++++++++++

error[E0615]: attempted to take value of method `ban` on type `X`
  --> $DIR/fn-or-tuple-struct-without-args.rs:43:22
   |
LL |     let _: usize = X.ban;
   |                      ^^^ method, not a field
   |
help: use parentheses to call the method
   |
LL |     let _: usize = X.ban();
   |                         ++

error[E0615]: attempted to take value of method `bal` on type `X`
  --> $DIR/fn-or-tuple-struct-without-args.rs:44:22
   |
LL |     let _: usize = X.bal;
   |                      ^^^ method, not a field
   |
help: use parentheses to call the method
   |
LL |     let _: usize = X.bal();
   |                         ++

error[E0308]: mismatched types
  --> $DIR/fn-or-tuple-struct-without-args.rs:46:20
   |
LL |     let closure = || 42;
   |                   -- the found closure
LL |     let _: usize = closure;
   |            -----   ^^^^^^^ expected `usize`, found closure
   |            |
   |            expected due to this
   |
   = note: expected type `usize`
           found closure `{closure@$DIR/fn-or-tuple-struct-without-args.rs:45:19: 45:21}`
help: use parentheses to call this closure
   |
LL |     let _: usize = closure();
   |                           ++

error: aborting due to 17 previous errors

Some errors have detailed explanations: E0308, E0533, E0615.
For more information about an error, try `rustc --explain E0308`.