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Make type contexts expect a value of type Type. (#2357)

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In particular, this means that a type can implement `ImplicitAs(Type)` and have values of that type behave like types.

This implies that `()` and `{}` are no longer types. They are now values whose type is the result of converting `()` or `{}` to type `Type`, as has been discussed recently and seems to be the supported direction. This fixes various cases where these types were previously mishandled.
This commit is contained in:
Richard Smith
2022-10-28 08:20:49 -07:00
committed by GitHub
parent f46eaf49a2
commit 0219218b01
40 changed files with 674 additions and 319 deletions
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explorer/testdata/basic_syntax/fail_alternative_not_type.carbon
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+1 -1
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@@ -8,7 +8,7 @@
package ExplorerTest api;
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_alternative_not_type.carbon:[[@LINE+1]]: Expected a type, but got (42)
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_alternative_not_type.carbon:[[@LINE+1]]: type error in type expression: '(i32)' is not implicitly convertible to 'Type'
choice C { X(42) }
fn Main() -> i32 {
explorer/testdata/basic_syntax/fail_nested_binding.carbon
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+1 -1
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@@ -9,7 +9,7 @@
package ExplorerTest api;
fn Main() -> i32 {
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_nested_binding.carbon:[[@LINE+1]]: The type of a binding pattern cannot contain bindings.
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_nested_binding.carbon:[[@LINE+1]]: the type of a binding pattern cannot contain bindings
var x: (T: Type) = 1;
return 1;
}
explorer/testdata/basic_syntax/fail_var_type.carbon
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+1 -1
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@@ -11,7 +11,7 @@ package ExplorerTest api;
fn Main () -> i32
{
// 42 cannot be used as the type of a variable.
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_var_type.carbon:[[@LINE+1]]: Expected a type, but got 42
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_var_type.carbon:[[@LINE+1]]: type error in type of name binding: 'i32' is not implicitly convertible to 'Type'
var x: 42 = 0;
return x;
}