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+## Shells are space sensitive. Use '< <(cmd)', not '<<(cmd)'.
+
+### Problematic code:
+
+    while IFS= read -r line
+    do
+      printf "%q\n" "$line"
+    done <<(curl -s http://example.com)
+
+### Correct code:
+
+    while IFS= read -r line
+    do
+      printf "%q\n" "$line"
+    done <  <(curl -s http://example.com)
+
+### Rationale:
+
+You are using `<<(` which is an invalid construct.
+
+You probably meant to redirect `<` from process substitution `<(..)` instead. To do this, a space is needed between the `<` and `<(..)`, i.e. `< <(cmd)`.
+
+### Exceptions:
+
+None.
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