doc: mention the use of replacements to resolve imports for 1.12
Updates #26241
Change-Id: I8ffac13d9cc1ee4d4de8fcd2042a7fa60fca567b
Reviewed-on: https://go-review.googlesource.com/c/153157
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/doc/go1.12.html b/doc/go1.12.html
index 291c19a..4c27650 100644
--- a/doc/go1.12.html
+++ b/doc/go1.12.html
@@ -138,6 +138,17 @@
that build fails.
</p>
+<p><!-- CL 152739 -->
+ When an import cannot be resolved using the active modules,
+ the <code>go</code> command will now try to use the modules mentioned in the
+ main module's <code>replace</code> directives before consulting the module
+ cache and the usual network sources.
+ If a matching replacement is found but the <code>replace</code> directive does
+ not specify a version, the <code>go</code> command uses a pseudo-version
+ derived from the zero <code>time.Time</code> (such
+ as <code>v0.0.0-00010101000000-000000000000</code>).
+</p>
+
<h3 id="compiler">Compiler toolchain</h3>
<p><!-- CL 134155, 134156 -->
