avoid type-check body of DefId

src/librustc_typeck/check/op.rs

@@ -443,6 +443,9 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
     ) -> bool /* did we suggest to call a function because of missing parenthesis? */ {
         err.span_label(span, ty.to_string());
         if let FnDef(def_id, _) = ty.sty {
+            if self.tcx.has_typeck_tables(def_id) == false {
+                return false;
+            }
             let source_map = self.tcx.sess.source_map();
             let hir_id = &self.tcx.hir().as_local_hir_id(def_id).unwrap();
             let fn_sig = {
@@ -455,6 +458,9 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
             };
 
             let other_ty = if let FnDef(def_id, _) = other_ty.sty {
+                if self.tcx.has_typeck_tables(def_id) == false {
+                    return false;
+                }
                 let hir_id = &self.tcx.hir().as_local_hir_id(def_id).unwrap();
                 match self.tcx.typeck_tables_of(def_id).liberated_fn_sigs().get(*hir_id) {
                     Some(f) => f.clone().output(),

src/test/ui/issues/issue-59488.rs

@@ -8,6 +8,10 @@ fn bar(a: i64) -> i64 {
     43
 }
 
+enum Foo {
+    Bar(usize),
+}
+
 fn main() {
     foo > 12;
     //~^ ERROR binary operation `>` cannot be applied to type `fn() -> i32 {foo}` [E0369]
@@ -23,4 +27,11 @@ fn main() {
     foo > bar;
     //~^ ERROR binary operation `>` cannot be applied to type `fn() -> i32 {foo}` [E0369]
     //~| ERROR mismatched types [E0308]
+
+    let i = Foo::Bar;
+    assert_eq!(Foo::Bar, i);
+    //~^ ERROR binary operation `==` cannot be applied to type `fn(usize) -> Foo {Foo::Bar}` [E0369]
+    //~| ERROR `fn(usize) -> Foo {Foo::Bar}` doesn't implement `std::fmt::Debug` [E0277]
+    //~| ERROR `fn(usize) -> Foo {Foo::Bar}` doesn't implement `std::fmt::Debug` [E0277]
 }
+

src/test/ui/issues/issue-59488.stderr

@@ -1,5 +1,5 @@
 error[E0369]: binary operation `>` cannot be applied to type `fn() -> i32 {foo}`
-  --> $DIR/issue-59488.rs:12:9
+  --> $DIR/issue-59488.rs:16:9
    |
 LL |     foo > 12;
    |     --- ^ -- {integer}
@@ -8,7 +8,7 @@ LL |     foo > 12;
    |     help: you might have forgotten to call this function: `foo()`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-59488.rs:12:11
+  --> $DIR/issue-59488.rs:16:11
    |
 LL |     foo > 12;
    |           ^^ expected fn item, found integer
@@ -17,7 +17,7 @@ LL |     foo > 12;
               found type `i32`
 
 error[E0369]: binary operation `>` cannot be applied to type `fn(i64) -> i64 {bar}`
-  --> $DIR/issue-59488.rs:16:9
+  --> $DIR/issue-59488.rs:20:9
    |
 LL |     bar > 13;
    |     --- ^ -- {integer}
@@ -26,7 +26,7 @@ LL |     bar > 13;
    |     help: you might have forgotten to call this function: `bar( /* arguments */ )`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-59488.rs:16:11
+  --> $DIR/issue-59488.rs:20:11
    |
 LL |     bar > 13;
    |           ^^ expected fn item, found integer
@@ -35,7 +35,7 @@ LL |     bar > 13;
               found type `i64`
 
 error[E0369]: binary operation `>` cannot be applied to type `fn() -> i32 {foo}`
-  --> $DIR/issue-59488.rs:20:9
+  --> $DIR/issue-59488.rs:24:9
    |
 LL |     foo > foo;
    |     --- ^ --- fn() -> i32 {foo}
@@ -51,7 +51,7 @@ LL |     foo > foo();
    |           ^^^^^
 
 error[E0369]: binary operation `>` cannot be applied to type `fn() -> i32 {foo}`
-  --> $DIR/issue-59488.rs:23:9
+  --> $DIR/issue-59488.rs:27:9
    |
 LL |     foo > bar;
    |     --- ^ --- fn(i64) -> i64 {bar}
@@ -61,15 +61,49 @@ LL |     foo > bar;
    = note: an implementation of `std::cmp::PartialOrd` might be missing for `fn() -> i32 {foo}`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-59488.rs:23:11
+  --> $DIR/issue-59488.rs:27:11
    |
 LL |     foo > bar;
    |           ^^^ expected fn item, found a different fn item
    |
    = note: expected type `fn() -> i32 {foo}`
               found type `fn(i64) -> i64 {bar}`
 
-error: aborting due to 7 previous errors
+error[E0369]: binary operation `==` cannot be applied to type `fn(usize) -> Foo {Foo::Bar}`
+  --> $DIR/issue-59488.rs:32:5
+   |
+LL |     assert_eq!(Foo::Bar, i);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^
+   |     |
+   |     fn(usize) -> Foo {Foo::Bar}
+   |     fn(usize) -> Foo {Foo::Bar}
+   |
+   = note: an implementation of `std::cmp::PartialEq` might be missing for `fn(usize) -> Foo {Foo::Bar}`
+   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
+
+error[E0277]: `fn(usize) -> Foo {Foo::Bar}` doesn't implement `std::fmt::Debug`
+  --> $DIR/issue-59488.rs:32:5
+   |
+LL |     assert_eq!(Foo::Bar, i);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^ `fn(usize) -> Foo {Foo::Bar}` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`
+   |
+   = help: the trait `std::fmt::Debug` is not implemented for `fn(usize) -> Foo {Foo::Bar}`
+   = note: required because of the requirements on the impl of `std::fmt::Debug` for `&fn(usize) -> Foo {Foo::Bar}`
+   = note: required by `std::fmt::Debug::fmt`
+   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
+
+error[E0277]: `fn(usize) -> Foo {Foo::Bar}` doesn't implement `std::fmt::Debug`
+  --> $DIR/issue-59488.rs:32:5
+   |
+LL |     assert_eq!(Foo::Bar, i);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^ `fn(usize) -> Foo {Foo::Bar}` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`
+   |
+   = help: the trait `std::fmt::Debug` is not implemented for `fn(usize) -> Foo {Foo::Bar}`
+   = note: required because of the requirements on the impl of `std::fmt::Debug` for `&fn(usize) -> Foo {Foo::Bar}`
+   = note: required by `std::fmt::Debug::fmt`
+   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
+
+error: aborting due to 10 previous errors
 
-Some errors have detailed explanations: E0308, E0369.
-For more information about an error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0277, E0308, E0369.
+For more information about an error, try `rustc --explain E0277`.