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Form-aware textual format for return parameters and arguments (#6588)

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The key changes are:
- Function output parameters are now prefixed with `out`, and more
consistently formatted as named parameters.
- Function and inst output arguments are now written as part of the inst
form, rather than as one of the inst arguments.

As a drive-by fix, this also changes `Temporary::storage_id` from
`DestInstId` to `InstId`, because it doesn't represent an output
parameter of the `Temporary` inst itself.

See the review of
[#6532](https://github.com/carbon-language/carbon-lang/pull/6532) and
[this Discord
discussion](https://discord.com/channels/655572317891461132/999638000126394370/1458268977020141589)
for additional background.
This commit is contained in:
Geoff Romer
2026-01-14 23:27:21 +00:00
committed by GitHub
parent 9861c31476
commit 4329a83e4c
353 changed files with 1779 additions and 1721 deletions
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toolchain/check/testdata/interop/cpp/enum/anonymous.carbon
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@@ -117,7 +117,7 @@ fn G() {
// CHECK:STDOUT: %.loc10_11.1: ref %C = temporary_storage
// CHECK:STDOUT: %addr: %ptr.d9e = addr_of %.loc10_11.1
// CHECK:STDOUT: %C__carbon_thunk.call: init %empty_tuple.type = call imports.%C__carbon_thunk.decl(%addr)
// CHECK:STDOUT: %.loc10_11.2: init %C = in_place_init %C__carbon_thunk.call, %.loc10_11.1
// CHECK:STDOUT: %.loc10_11.2: init %C to %.loc10_11.1 = in_place_init %C__carbon_thunk.call
// CHECK:STDOUT: %.loc10_11.3: ref %C = temporary %.loc10_11.1, %.loc10_11.2
// CHECK:STDOUT: %F.ref.loc10: %C.F.cpp_overload_set.type = name_ref F, imports.%C.F.cpp_overload_set.value [concrete = constants.%C.F.cpp_overload_set.value]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %.loc10_11.3, %F.ref.loc10