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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/pointer/basic.carbon
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@@ -116,7 +116,7 @@ fn F() -> i32 {
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() -> %i32 {
// CHECK:STDOUT: fn @F() -> out %return.param: %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %n.patt: %pattern_type.7ce = ref_binding_pattern n [concrete]