transpile: Improve case translation - #1776
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is_pattern to ExprContext for customized case translationcase translation
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can_propagate_castfunction, elide some more casts #1770i32#1774Translating
casestatements is currently a very ad-hoc affair, so this is an attempt to make it a bit more generic and flexible.expr_to_patnow converts expressions to equivalent patterns, preserving the semantics and returningNoneif an expression with no equivalent is encountered.Translation functions can now use
is_patternto detect if they are translating an expression that's meant to appear inside a Rust pattern, and adjust accordingly. That will help towards getting #1775 to work. Currently, all expressions that cannot (conservatively) be translated in pattern context return a translation error. That will then trigger fallback to directly using theConstIntExprvalue that's provided inside theCasevalue.Additionally, it seems that it fixes a missing macro expansion in
macrocase.c, so that's a bonus!