foo.cc: In function 'T read()':
foo.cc:13:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (;!isdigit(ch);ch=getchar())
     ^~~
foo.cc:15:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
         for(;isdigit(ch);ch = getchar())    sum=sum*10+ch-'0';
         ^~~

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