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Remove ImportRefUsed (#3934)

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This was to track use of a declaration after import, prior to a
redeclaration. Per [discussion on
Discord](https://discord.com/channels/655572317891461132/1217182321933815820/1236016521059237962),
we likely don't need this check due to the change in behavior of
`extern`.

Rather than potentially getting one of many `extern` decls and depending
on it by accident, it is now planned to be _required_ to be imported,
and the library doing a non-`extern` decl must _know_ it's importing the
`extern` decl. The stricter requirement on the library means it now
seems more reasonable to use the `extern` decl.

So kind of rolling back #3831, though keeping `ImportIRInstId` (at least
for now) and keeping `Loaded`/`Unloaded` terminology (seems a nicer
fit).
This commit is contained in:
Jon Ross-Perkins
2024-05-03 23:33:42 +00:00
committed by GitHub
parent 76ed3c73cb
commit 92fa0ac1ac
76 changed files with 361 additions and 475 deletions
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toolchain/check/testdata/pointer/import.carbon
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@@ -62,7 +62,7 @@ var a: i32* = a_ref;
// CHECK:STDOUT: .a = %a
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref.1 = import_ref ir0, inst+3, unloaded
// CHECK:STDOUT: %import_ref.2: ref i32* = import_ref ir0, inst+10, loc_11
// CHECK:STDOUT: %import_ref.2: ref i32* = import_ref ir0, inst+10, loaded
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %.loc4: type = ptr_type i32 [template = constants.%.1]
// CHECK:STDOUT: %a.var: ref i32* = var a