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Use As and ImplicitAs interfaces for conversions. (#4209)

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Add these interfaces to the core library. For now, they're two separate
interfaces because we don't yet support one interface extending another.

This collapses a lot of the layering in check: for example, the call
building logic depends on implicit conversions, conversions now depend
on the overloaded operator machinery, and that machinery depends on
building calls.

In passing, improve the diagnostics for failing to find a name required
from the prelude. Also convert all the transitively-called code from
`NodeId` to `LocId` given the latter is what the conversion machinery
has available.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Richard Smith
2024-09-05 23:39:58 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 2d650f7d16
commit 187a3608df
466 changed files with 6590 additions and 943 deletions
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toolchain/check/testdata/function/declaration/param_same_name.carbon
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@@ -31,6 +31,7 @@ fn G(a: i32);
// CHECK:STDOUT: import Core//prelude/operators
// CHECK:STDOUT: import Core//prelude/types
// CHECK:STDOUT: import Core//prelude/operators/arithmetic
// CHECK:STDOUT: import Core//prelude/operators/as
// CHECK:STDOUT: import Core//prelude/operators/bitwise
// CHECK:STDOUT: import Core//prelude/operators/comparison
// CHECK:STDOUT: import Core//prelude/types/bool