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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/function/call/empty_struct.carbon
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@@ -59,7 +59,7 @@ fn Main() {
// CHECK:STDOUT: %Main.decl: %Main.type = fn_decl @Main [concrete = constants.%Main] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Echo(%a.param: %empty_struct_type) -> %empty_struct_type {
// CHECK:STDOUT: fn @Echo(%a.param: %empty_struct_type) -> out %return.param: %empty_struct_type {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %a.ref: %empty_struct_type = name_ref a, %a
// CHECK:STDOUT: %.loc16_10: init %empty_struct_type = struct_init () [concrete = constants.%empty_struct]