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+An identifier was used like a function name or a value was expected and the
+identifier exists but it belongs to a different namespace.
+
+Erroneous code example:
+
+```compile_fail,E0423
+struct Foo { a: bool };
+
+let f = Foo();
+// error: expected function, tuple struct or tuple variant, found `Foo`
+// `Foo` is a struct name, but this expression uses it like a function name
+```
+
+Please verify you didn't misspell the name of what you actually wanted to use
+here. Example:
+
+```
+fn Foo() -> u32 { 0 }
+
+let f = Foo(); // ok!
+```
+
+It is common to forget the trailing `!` on macro invocations, which would also
+yield this error:
+
+```compile_fail,E0423
+println("");
+// error: expected function, tuple struct or tuple variant,
+// found macro `println`
+// did you mean `println!(...)`? (notice the trailing `!`)
+```
+
+Another case where this error is emitted is when a value is expected, but
+something else is found:
+
+```compile_fail,E0423
+pub mod a {
+    pub const I: i32 = 1;
+}
+
+fn h1() -> i32 {
+    a.I
+    //~^ ERROR expected value, found module `a`
+    // did you mean `a::I`?
+}
+```