Corentin Jabot 424733c12a Implement if consteval (P1938) ...

Modify the IfStmt node to suppoort constant evaluated expressions.

Add a new ExpressionEvaluationContext::ImmediateFunctionContext to
keep track of immediate function contexts.

This proved easier/better/probably more efficient than walking the AST
backward as it allows diagnosing nested if consteval statements.

2021-10-05 08:04:14 -04:00

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