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Remove ExpectType and some calls to IsImplicitlyConvertible. (#2647)

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These functions are dangerous, as they check whether conversions are possible without actually performing the conversions. In each case where they were used, explorer would crash in some cases if a user-defined conversion is required.

This change moves us more towards implicit conversions being handled by a regular function call on an interface and away from them being magical builtins. Unfortunately, this exposes a pre-existing bug that a call of the form `x.(ImplicitAs(T).Convert)()` compiles even if `x` only has an explicit conversion to `T`. That's worked around here for now, but will need a proper fix later.
This commit is contained in:
Richard Smith
2023-03-02 14:04:44 -08:00
committed by GitHub
parent 21c3f64564
commit c8141b59d9
16 changed files with 152 additions and 53 deletions
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explorer/testdata/tuple/fail_to_array.carbon
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@@ -10,6 +10,6 @@ package ExplorerTest api;
fn Main() -> i32 {
var t: auto = (1, 2);
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/tuple/fail_to_array.carbon:[[@LINE+1]]: type error in name binding: '(i32, i32)' is not implicitly convertible to '[i32; 3]'
// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/tuple/fail_to_array.carbon:[[@LINE+1]]: type error in initializer of variable: '(i32, i32)' is not implicitly convertible to '[i32; 3]'
var a: [i32; 3] = t;
}