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Add support for compound assignment and increment (#2526)

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Add support for user-defined assignment, as well as compound assignment and increment, following the design direction in pending proposal #2511.

Some of this isn't fully testable yet: because explorer doesn't properly support `impl` specialization, the blanket `impl`s in the prelude prevent types from customizing assignment.
This commit is contained in:
Richard Smith
2023-01-20 18:48:13 -08:00
committed by GitHub
parent f1a0645551
commit 2fd7e2b65d
32 changed files with 975 additions and 215 deletions
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explorer/testdata/struct/fail_assign_different_types.carbon
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+1 -1
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@@ -10,7 +10,7 @@ package ExplorerTest api;
fn Main() -> i32 {
var p: auto = {.x = 0, .y = 0};
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/struct/fail_assign_different_types.carbon:[[@LINE+1]]: type error in assignment: '{.y: i32}' is not implicitly convertible to '{.x: i32, .y: i32}'
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/struct/fail_assign_different_types.carbon:[[@LINE+1]]: could not find implementation of interface AssignWith(U = {.y: i32}) for {.x: i32, .y: i32}
p = {.y = 0};
return 0;
}