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docs/markdown/snippets/configure_file_overwrite_warning.md

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+## Meson warns if two calls to configure_file() write to the same file
+
+If two calls to [`configure_file()`](#Reference-manual.md#configure_file)
+write to the same file Meson will print a `WARNING:` message during
+configuration. For example:
+```meson
+project('configure_file', 'cpp')
+
+configure_file(
+      input: 'a.in',
+      output: 'out',
+      command: ['./foo.sh']
+    )
+configure_file(
+  input: 'a.in',
+  output: 'out',
+  command: ['./foo.sh']
+)
+
+```
+
+This will output:
+
+```
+The Meson build system
+Version: 0.47.0.dev1
+Source dir: /path/to/srctree
+Build dir: /path/to/buildtree
+Build type: native build
+Project name: configure_file
+Project version: undefined
+Build machine cpu family: x86_64
+Build machine cpu: x86_64
+Configuring out with command
+WARNING: Output file out for configure_file overwritten. First time written in line 3 now in line 8
+Configuring out with command
+Build targets in project: 0
+Found ninja-1.8.2 at /usr/bin/ninja
+```