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Initial implementation of unformed state for local variables. (#1387)

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Allows unformed state for local variables. Reports a run-time error when an unformed local variable is used.
- Added declaration without initialization for local variables in the parser.
- Made the init expression of VariableDefinition optional.
- Expanded (alive, dead) to (uninitialized, alive, dead) in the Heap.

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Zenong Zhang
2022-07-20 16:03:52 -04:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 04cfcc1dc2
commit 52ee050019
22 changed files with 327 additions and 43 deletions
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explorer/testdata/basic_syntax/fail_var_named_self.carbon
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@@ -14,7 +14,7 @@ fn Main() -> i32 {
// Error: can't use keyword `Self` as the name of a variable.
// TODO: Current error message is unclear, better would be to say
// something like: unexpected `Self`, expecting identifier
// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_var_named_self.carbon:[[@LINE+1]]: syntax error, unexpected COLON, expecting EQUAL
// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/basic_syntax/fail_var_named_self.carbon:[[@LINE+1]]: syntax error, unexpected COLON, expecting EQUAL or SEMICOLON
var Self : i32 = 0;
return Self;
}