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Update discussion of trace flag in README (#1386)
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@@ -72,11 +72,11 @@ boilerplate at the top:
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// RUN: explorer %s 2>&1 | \
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// RUN: FileCheck --match-full-lines --allow-unused-prefixes=false %s
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// RUN: explorer --trace %s 2>&1 | \
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// RUN: FileCheck --match-full-lines --allow-unused-prefixes %s
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// AUTOUPDATE: explorer %s
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// RUN: %{explorer} %s 2>&1 | \
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// RUN: %{FileCheck} --match-full-lines --allow-unused-prefixes=false %s
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// RUN: %{explorer} --parser_debug --trace_file=- %s 2>&1 | \
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// RUN: %{FileCheck} --match-full-lines --allow-unused-prefixes %s
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// AUTOUPDATE: %{explorer} %s
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// CHECK: result: 0
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package ExplorerTest api;
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@@ -86,11 +86,11 @@ To explain this boilerplate:
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- The standard copyright is expected.
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- The `RUN` lines indicate two commands for `lit` to execute using the file:
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one without `--trace` output, one with.
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one without trace and debug output, one with.
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- Output is piped to `FileCheck` for verification.
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- Setting `-allow-unused-prefixes` to false when processing the ordinary
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output, and true when handling the `--trace` output, allows us to omit
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the tracing output from the `CHECK` lines, while ensuring they cover all
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output, and true when handling the trace output, allows us to omit the
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tracing output from the `CHECK` lines, while ensuring they cover all
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non-tracing output.
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- Setting `-match-full-lines` in both cases indicates that each `CHECK`
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line must match a complete output line, with no extra characters before
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