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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/function/qualified_param.carbon
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@@ -117,7 +117,7 @@ fn F() {
// CHECK:STDOUT: }
// CHECK:STDOUT: %s.var: ref %S = var %s.var_patt
// CHECK:STDOUT: %.loc10_19.1: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc10_19.2: init %S = class_init (), %s.var [concrete = constants.%S.val]
// CHECK:STDOUT: %.loc10_19.2: init %S to %s.var = class_init () [concrete = constants.%S.val]
// CHECK:STDOUT: %.loc10_3: init %S = converted %.loc10_19.1, %.loc10_19.2 [concrete = constants.%S.val]
// CHECK:STDOUT: assign %s.var, %.loc10_3
// CHECK:STDOUT: %.loc10_13: type = splice_block %S.ref [concrete = constants.%S] {