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Make the tree structure more explicit in parse dumps (#7591)
It's hard to track 2-space indent levels across large vertical gaps, and it can be hard to suppress the instinct to read the dump as if it were preorder. This change introduces a new dump mode that addresses both problems by using box-drawing characters to explicitly represent the parent-child edges of the tree. This new mode is the default, but the old behavior remains available with `--parse-dump-format=yaml-postorder`.
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@@ -16,16 +16,15 @@
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fn F(template x:? Form);
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// CHECK:STDOUT: - filename: fail_template_form_param.carbon
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// CHECK:STDOUT: parse_tree: [
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// CHECK:STDOUT: {kind: 'FileStart', text: ''},
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// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
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// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'F'},
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// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
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// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'x'},
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// CHECK:STDOUT: {kind: 'BindingPatternTypeStart', text: ':?', has_error: yes},
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// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Form'},
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// CHECK:STDOUT: {kind: 'FormBindingPattern', text: ':?', has_error: yes, subtree_size: 4},
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// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', has_error: yes, subtree_size: 6},
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// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 9},
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// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
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// CHECK:STDOUT: ]
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// CHECK:STDOUT: ╭─FileStart ''
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// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
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// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'F'
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// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
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// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
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// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':?' has_error
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// CHECK:STDOUT: │ │ │ ├─IdentifierNameExpr 'Form'
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// CHECK:STDOUT: │ │ ├─FormBindingPattern ':?' has_error
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// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
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// CHECK:STDOUT: ├─FunctionDecl ';'
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// CHECK:STDOUT: ├─FileEnd ''
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// CHECK:STDOUT: (root)
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