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Support struct implicit conversions in type-checking (#870)

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I should emphasize that I am **completely cheating** here. This PR does not add support for actually _performing_  implicit conversions at run time, because the AST doesn't yet contain the necessary type information. At run time, code like `var p: Point = {.x = 1, .y = 2};` directly initializes the name `p` with the _struct_ value `{.x = 1, .y = 2}`; no object of type `Point` is actually created. I'm only getting away with this because we don't yet have any tests that can tell the difference.

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
This commit is contained in:
Geoff Romer
2021-10-12 10:27:20 -07:00
committed by GitHub
co-authored by Jon Meow
parent a99d882223
commit bc5a42211b
14 changed files with 226 additions and 60 deletions
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executable_semantics/testdata/tuple/fail_name_order.carbon
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@@ -7,7 +7,7 @@
// RUN: not executable_semantics --trace %s 2>&1 | \
// RUN: FileCheck --match-full-lines --allow-unused-prefixes %s
// AUTOUPDATE: executable_semantics %s
// CHECK: PROGRAM ERROR: {{.*}}/executable_semantics/testdata/tuple/fail_name_order.carbon:17: Tuple field name 'y' does not match pattern field name 'x'
// CHECK: COMPILATION ERROR: {{.*}}/executable_semantics/testdata/tuple/fail_name_order.carbon:17: type error in name binding: '(y = i32, x = i32)' is not implicitly convertible to '(x = i32, y = i32)'
package ExecutableSemanticsTest api;