Handle easy try-block desugar#3997
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gcc/rust/ChangeLog: * ast/rust-ast.h: Add the new variant. * ast/rust-expr.h: Use it for TryExpr class.
gcc/rust/ChangeLog: * Make-lang.in: Compile it. * ast/rust-expression-yeast.cc (ExpressionYeast::dispatch): Dispatch to try-block desugar. * ast/rust-desugar-try-block.cc: New file. * ast/rust-desugar-try-block.h: New file. gcc/testsuite/ChangeLog: * rust/compile/try_block1.rs: New test.
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This PR adds a desugar dispatcher for expressions, called expression yeast (since yeast consumes all the sugar...) and a desugar for try-block in the easy case, which is the most common in
core. Basically, it can handle try-blocks with a tail expression and no statements - as that requires block labels to be handled properly